rm outdated comment

Doing the type construction in the runtime function didn't work with type
     variables

Author: mlechu

src/runtime.jl

@@ -319,10 +319,6 @@ end
 Called in the unfortunate cases (K"call", K".", K"Identifier") where docstrings
 change the semantics of the expressions they annotate, no longer requiring the
 expression to execute.
-
-If documenting a call expression, `func_sig` is (types, first_optional_arg_pos),
-where `types` is the function signature including all optional arguments and
-excluding the implicit first function_type argument (which may not be defined).
 """
 function bind_static_docs!(mod::Module, name::Symbol, docstr, lnn::LineNumberNode, sigtypes::Type)
     metadata = Dict{Symbol, Any}(