Remove 'variable' RST directives

Replace with `.. data::` instead since they are both used for the
same kind of docstrings.

doc/genstdlib.jl

@@ -3,7 +3,7 @@ module GenStdLib
 import Base.Docs: Binding, DocStr
 
 # Constants.
-const DOCSTRING_DIRECTIVE = r"^(.. (function|type|variable|data):: ).*"
+const DOCSTRING_DIRECTIVE = r"^(.. (function|type|data):: ).*"
 
 # Types.
 

doc/stdlib/base.rst

@@ -966,7 +966,7 @@ System
 
    A singleton of this type provides a hash table interface to environment variables.
 
-.. variable:: ENV
+.. data:: ENV
 
    .. Docstring generated from Julia source
 

doc/stdlib/constants.rst

@@ -3,79 +3,79 @@
 Constants
 =========
 
-.. variable:: nothing
+.. data:: nothing
 
    .. Docstring generated from Julia source
 
    The singleton instance of type ``Void``\ , used by convention when there is no value to return (as in a C ``void`` function). Can be converted to an empty ``Nullable`` value.
 
-.. variable:: PROGRAM_FILE
+.. data:: PROGRAM_FILE
 
    .. Docstring generated from Julia source
 
    A string containing the script name passed to Julia from the command line. Note that the script name remains unchanged from within included files. Alternatively see :data:`@__FILE__`\ .
 
-.. variable:: ARGS
+.. data:: ARGS
 
    .. Docstring generated from Julia source
 
    An array of the command line arguments passed to Julia, as strings.
 
-.. variable:: C_NULL
+.. data:: C_NULL
 
    .. Docstring generated from Julia source
 
    The C null pointer constant, sometimes used when calling external code.
 
-.. variable:: VERSION
+.. data:: VERSION
 
    .. Docstring generated from Julia source
 
    A ``VersionNumber`` object describing which version of Julia is in use. For details see :ref:`man-version-number-literals`\ .
 
-.. variable:: LOAD_PATH
+.. data:: LOAD_PATH
 
    .. Docstring generated from Julia source
 
    An array of paths (as strings) where the ``require`` function looks for code.
 
-.. variable:: JULIA_HOME
+.. data:: JULIA_HOME
 
    .. Docstring generated from Julia source
 
    A string containing the full path to the directory containing the ``julia`` executable.
 
-.. variable:: ANY
+.. data:: ANY
 
    .. Docstring generated from Julia source
 
    Equivalent to ``Any`` for dispatch purposes, but signals the compiler to skip code generation specialization for that field.
 
-.. variable:: Sys.CPU_CORES
+.. data:: Sys.CPU_CORES
 
    .. Docstring generated from Julia source
 
    The number of CPU cores in the system.
 
-.. variable:: Sys.WORD_SIZE
+.. data:: Sys.WORD_SIZE
 
    .. Docstring generated from Julia source
 
    Standard word size on the current machine, in bits.
 
-.. variable:: Sys.KERNEL
+.. data:: Sys.KERNEL
 
    .. Docstring generated from Julia source
 
    A symbol representing the name of the operating system, as returned by ``uname`` of the build configuration.
 
-.. variable:: Sys.ARCH
+.. data:: Sys.ARCH
 
    .. Docstring generated from Julia source
 
    A symbol representing the architecture of the build configuration.
 
-.. variable:: Sys.MACHINE
+.. data:: Sys.MACHINE
 
    .. Docstring generated from Julia source
 

doc/stdlib/io-network.rst

@@ -7,19 +7,19 @@
 General I/O
 -----------
 
-.. variable:: STDOUT
+.. data:: STDOUT
 
    .. Docstring generated from Julia source
 
    Global variable referring to the standard out stream.
 
-.. variable:: STDERR
+.. data:: STDERR
 
    .. Docstring generated from Julia source
 
    Global variable referring to the standard error stream.
 
-.. variable:: STDIN
+.. data:: STDIN
 
    .. Docstring generated from Julia source
 
@@ -1012,7 +1012,7 @@ Network I/O
 
    Converts the endianness of a value from that used by the Host to Little-endian.
 
-.. variable:: ENDIAN_BOM
+.. data:: ENDIAN_BOM
 
    .. Docstring generated from Julia source
 

doc/stdlib/libdl.rst

@@ -22,14 +22,14 @@ The names in :mod:`Base.Libdl` are not exported and need to be called e.g. as ``
 
    Similar to :func:`dlopen`\ , except returns a ``NULL`` pointer instead of raising errors.
 
-.. variable:: RTLD_DEEPBIND
-              RTLD_FIRST
-              RTLD_GLOBAL
-              RTLD_LAZY
-              RTLD_LOCAL
-              RTLD_NODELETE
-              RTLD_NOLOAD
-              RTLD_NOW
+.. data:: RTLD_DEEPBIND
+          RTLD_FIRST
+          RTLD_GLOBAL
+          RTLD_LAZY
+          RTLD_LOCAL
+          RTLD_NODELETE
+          RTLD_NOLOAD
+          RTLD_NOW
 
    .. Docstring generated from Julia source
 
@@ -65,7 +65,7 @@ The names in :mod:`Base.Libdl` are not exported and need to be called e.g. as ``
 
    Searches for the first library in ``names`` in the paths in the ``locations`` list, ``DL_LOAD_PATH``\ , or system library paths (in that order) which can successfully be dlopen'd. On success, the return value will be one of the names (potentially prefixed by one of the paths in locations). This string can be assigned to a ``global const`` and used as the library name in future ``ccall``\ 's. On failure, it returns the empty string.
 
-.. variable:: DL_LOAD_PATH
+.. data:: DL_LOAD_PATH
 
    .. Docstring generated from Julia source
 

doc/stdlib/math.rst

@@ -904,37 +904,37 @@ Mathematical Functions
    * :obj:`RoundUp`
    * :obj:`RoundDown`
 
-.. variable:: RoundNearest
+.. data:: RoundNearest
 
    .. Docstring generated from Julia source
 
    The default rounding mode. Rounds to the nearest integer, with ties (fractional values of 0.5) being rounded to the nearest even integer.
 
-.. variable:: RoundNearestTiesAway
+.. data:: RoundNearestTiesAway
 
    .. Docstring generated from Julia source
 
    Rounds to nearest integer, with ties rounded away from zero (C/C++ :func:`round` behaviour).
 
-.. variable:: RoundNearestTiesUp
+.. data:: RoundNearestTiesUp
 
    .. Docstring generated from Julia source
 
    Rounds to nearest integer, with ties rounded toward positive infinity (Java/JavaScript :func:`round` behaviour).
 
-.. variable:: RoundToZero
+.. data:: RoundToZero
 
    .. Docstring generated from Julia source
 
    :func:`round` using this rounding mode is an alias for :func:`trunc`\ .
 
-.. variable:: RoundUp
+.. data:: RoundUp
 
    .. Docstring generated from Julia source
 
    :func:`round` using this rounding mode is an alias for :func:`ceil`\ .
 
-.. variable:: RoundDown
+.. data:: RoundDown
 
    .. Docstring generated from Julia source