Add missing docstrings in manual

[Saransh-cpp]

Addresses #19529

Some comments -

• Pkg, SparseArrays, and Statistics moved out.
• CoreLogging is not exported for the users.
• InteractiveUtils.peakflops was moved to LinearAlgebra, should I deprecate the function in another PR? (Comment above the function - # TODO: @deprecate peakflops to LinearAlgebra)
• Base.Docs.Text and Basi.Docs.HTML are considered to be deprecated and should not be used.
• I am not sure about how to add Base.Broadcast.broadcast_preserving_zero_d, Libdl exports, and some of the mathematical symbol exports from Base.
• There are a lot of Dates exports (day and month names) whose API documentation is missing, should I add them?
• Distributed.@spawn should not be used.
• Base.Grisu and `Base.Threads.RecursiveSpinLock`` have been removed.

I've tried to update the list below, but I might have missed some docstrings.

• Dates.Friday
• Pkg.GraphType.simplify_graph! :: Union{Tuple{Pkg.GraphType.Graph}, Tuple{Pkg.GraphType.Graph,Set{Int64}}}
• Base.:⊋
• Test.detect_ambiguities :: Tuple
• LibGit2.LibGit2
• CRC32c.CRC32c
• Base.:=>
• Dates.Wed
• Base.CoreLogging.current_logger :: Tuple{}
• Dates.March
• FileWatching.FileWatching
• Base.real :: Tuple{Type}
• Markdown.Markdown
• Base.Sys.uptime :: Tuple{}
• Base.Inf64
• Pkg.Types.handle_repos_add! :: Tuple{Pkg.Types.Context,AbstractArray{Pkg.Types.PackageSpec,1}}
• Base.CoreLogging.@warn
• Dates.Sun
• Dates.Oct
• Base.CoreLogging.NullLogger
• Dates.Week :: Tuple{Date}
• Dates.Week :: Tuple{DateTime}
• Dates.Week :: Tuple{Any}
• Base.MathConstants
• Pkg.GraphType.add_fixed! :: Tuple{Pkg.GraphType.Graph,Dict{UUID,Pkg.Types.Fixed}}
• Libdl.Libdl
• Base.complex :: Union{Tuple{Type{T}}, Tuple{T}} where T<:Real
• Future.Future
• Libdl.RTLD_GLOBAL
• Dates.Nanosecond :: Tuple{Any}
• Base.empty :: Union{Tuple{AbstractArray{T,1}}, Tuple{U}, Tuple{T}, Tuple{AbstractArray{T,1},Type{U}}} where U where T
• Base.empty :: Tuple{AbstractDict}
• Base.empty :: Tuple{Any}
• Dates.Year :: Tuple{Date}
• Dates.Year :: Tuple{DateTime}
• Dates.Year :: Tuple{Any}
• Base.MathConstants.π
• Base.CoreLogging.LogLevel
• Dates.May
• Pkg.RegistrySpec
• Base.CoreLogging.AbstractLogger
• Dates.Day :: Tuple{Date}
• Dates.Day :: Tuple{DateTime}
• Dates.Day :: Tuple{Any}
• Base.Sys.which :: Tuple{String}
• Dates.Microsecond :: Tuple{Any}
• Base.which :: Tuple{Module,Symbol}
• Pkg.Resolve.sanity_check :: Union{Tuple{Pkg.GraphType.Graph}, Tuple{Pkg.GraphType.Graph,Set{UUID}}, Tuple{Pkg.GraphType.Graph,Set{UUID},Bool}}
• Dates.Apr
• Pkg.GraphType.get_resolve_log :: Tuple{Pkg.GraphType.Graph}
• Pkg.GraphType.showlog :: Tuple{IO,Pkg.GraphType.ResolveLog}
• Pkg.GraphType.showlog :: Tuple{IO,Pkg.GraphType.ResolveLog,UUID}
• Base.Grisu.grisu :: Union{Tuple{AbstractFloat,Any,Any}, Tuple{AbstractFloat,Any,Any,Any}, Tuple{AbstractFloat,Any,Any,Any,Any}} - REMOVED
• Base.:* :: Tuple{Union{Regex, AbstractChar, AbstractString},Vararg{Union{Regex, AbstractChar, AbstractString},N} where N}
• Test.GenericSet
• Base.findprev :: Tuple{AbstractChar,AbstractString,Integer}
• Base.findprev :: Tuple{Function,Any,Any}
• Base.findprev :: Tuple{Any,Any}
• Base.eachcol :: Tuple{Union{AbstractArray{T,1}, AbstractArray{T,2}} where T}
• Dates.Sat
• Libdl.RTLD_NOLOAD
• Base.Threads.RecursiveSpinLock
• Base.MathConstants.φ
• REPL.TerminalMenus.RadioMenu
• REPL.TerminalMenus.RadioMenu :: Tuple{Array{String,1}}
• Dates.November
• Dates.Thursday
• Dates.Thu
• Libdl.RTLD_DEEPBIND
• Base.Broadcast.broadcast_preserving_zero_d :: Tuple{Any,Vararg{Any,N} where N}
• Base.MathConstants.γ
• Base.float :: Union{Tuple{Type{T}}, Tuple{T}} where T<:Number
• Dates.Sep
• Dates.June
• LibGit2.GitConfig :: Union{Tuple{AbstractString}, Tuple{AbstractString,LibGit2.Consts.GIT_CONFIG}, Tuple{AbstractString,LibGit2.Consts.GIT_CONFIG,Union{Nothing, GitRepo}}, Tuple{AbstractString,LibGit2.Consts.GIT_CONFIG,Union{Nothing, GitRepo},Bool}}
• LibGit2.GitConfig :: Tuple{GitRepo}
• LibGit2.GitConfig :: Union{Tuple{}, Tuple{LibGit2.Consts.GIT_CONFIG}}
• Dates.Millisecond :: Tuple{Time}
• Dates.Millisecond :: Tuple{Any}
• Base.Filesystem.contractuser :: Tuple{AbstractString} - Not available to users?
• Base.Regex
• Base.Sys.isjsvm :: Tuple{Symbol}
• Base.CoreLogging.@error
• Statistics.Statistics - Moved out
• Libdl.RTLD_NODELETE
• Base.eachslice :: Tuple{AbstractArray}
• Dates.July
• Dates.April
• Base.eachrow :: Tuple{Union{AbstractArray{T,1}, AbstractArray{T,2}} where T}
• Distributed.ProcessExitedException
• Dates.canonicalize :: Tuple{Dates.CompoundPeriod}
• Base.reduce :: Tuple{Any,AbstractArray}
• REPL.TerminalMenus.request :: Tuple{REPL.TerminalMenus.AbstractMenu}
• REPL.TerminalMenus.request :: Tuple{AbstractString,REPL.TerminalMenus.AbstractMenu}
• Dates.January
• Dates.Fri
• Pkg.PackageSpec
• Base.Rounding.setrounding :: Union{Tuple{T}, Tuple{Function,Type{T},RoundingMode}} where T
• Pkg.UpgradeLevel
• Test.GenericString
• Base.:∌
• Base.CoreLogging.SimpleLogger
• DelimitedFiles.DelimitedFiles
• Dates.Month :: Tuple{Date}
• Dates.Month :: Tuple{DateTime}
• Dates.Month :: Tuple{Any}
• Libdl.RTLD_LOCAL
• Dates.September
• Dates.Hour :: Tuple{Time}
• Dates.Hour :: Tuple{Any}
• Base.CoreLogging.global_logger :: Tuple{}
• REPL.TerminalMenus.MultiSelectMenu
• REPL.TerminalMenus.MultiSelectMenu :: Tuple{Array{String,1}}
• Base.mapreduce :: Tuple{Any,Any,AbstractArray}
• Core.NTuple
• Profile.Profile
• Base.AbstractChannel
• Base.Math.sincosd :: Tuple{Real}
• Test.GenericOrder
• Test.GenericDict
• Dates.Jul
• Dates.August
• Test.TestSetException
• Base.CoreLogging.@debug
• Base.:⊇
• Base.CoreLogging.with_logger :: Tuple{Function,Base.CoreLogging.AbstractLogger}
• Base.Sys.loadavg :: Tuple{}
• Dates.Aug
• Libdl.RTLD_LAZY
• Base.Pipe :: Tuple{}
• Pkg.Resolve.resolve :: Tuple{Pkg.GraphType.Graph}
• Dates.Tue
• Dates.Saturday
• Dates.Monday
• Base.Filesystem.mktempdir :: Union{Tuple{Function}, Tuple{Function,Any}}
• Base.Filesystem.mktempdir :: Union{Tuple{}, Tuple{Any}}
• Serialization.Serialization
• Test.Test
• Base.NaN64
• Mmap.Mmap
• Base.Sys.isexecutable :: Tuple{String}
• Base.:^ :: Tuple{Regex,Integer}
• Base.:^ :: Tuple{Union{AbstractChar, AbstractString},Integer}
• Dates.Nov
• Dates.Minute :: Tuple{Time}
• Dates.Minute :: Tuple{Any}
• Base.Sys.STDLIB
• Base.CoreLogging.disable_logging :: Tuple{Base.CoreLogging.LogLevel}
• LinearAlgebra.LinearAlgebra
• Base.Docs.HTML
• Base.:≉ :: Tuple
• Base.sizeof :: Tuple{Any}
• Distributed.@Spawn :: Tuple{Any} - DEPRECATED
• Dates.Dec
• Base.findfirst :: Tuple{AbstractChar,AbstractString}
• Dates.February
• Base.Experimental
• Test.detect_unbound_args :: Tuple
• Dates.October
• Base.CoreLogging.@logmsg
• Base.copy! :: Tuple{AbstractArray{T,1} where T,AbstractArray{T,1} where T}
• Dates.Mon
• Base.TaskFailedException
• Dates.Tuesday
• Base.Docs.Text
• Base.MathConstants.e
• Base.:∋
• Base.reverse :: Tuple{AbstractArray}
• Base.reverse :: Union{Tuple{AbstractArray{T,1} where T}, Tuple{AbstractArray{T,1} where T,Any}, Tuple{AbstractArray{T,1} where T,Any,Any}}
• Base.:⊆
• Base.findnext :: Tuple{Function,Any,Any}
• Base.findnext :: Tuple{Any,Any}
• Distributed.Distributed
• Core.@cmd :: Tuple{Any}
• Dates.Second :: Tuple{Time}
• Dates.Second :: Tuple{Any}
• Dates.Mar
• SharedArrays.SharedArrays
• SparseArrays.SparseArrays
• InteractiveUtils.peakflops :: Union{Tuple{}, Tuple{Integer}}
• Pkg.PackageMode
• Base.findall :: Tuple{Union{Regex, AbstractString},AbstractString}
• Base.CoreLogging.@info
• Dates.Dates
• Base.:⊉
• Dates.Jun
• Libdl.RTLD_FIRST
• Test.GenericArray
• Pkg.GraphType.add_reqs! :: Tuple{Pkg.GraphType.Graph,Dict{UUID,Pkg.Types.VersionSpec}}
• Dates.Feb
• Dates.Jan
• Dates.Sunday
• Dates.December
• Base.ncodeunits :: Tuple{Char}
• Dates.Wednesday

[KristofferC]

LGTM