Help: Add `.. versionadded` directives to commands documentation

This change ony concerns directives that appear in the document body.

The guidelines for inserting version directives:

 * Baseline version is CMake 3.0, i.e. directives start at 3.1.
 * Always use `.. versionadded::` directive, avoid ad-hoc version
   references. Exception: policy pages.
 * For new command signatures, put `versionadded` on a separate line
   after the signature.
 * For a group of new signatures in a new document section,
   a single version note at the beginning of the section is sufficient.
 * For new options, put `versionadded` on a separate line before
   option description.
 * If all the option descriptions in the list are short one-liners,
   it's fine to put `versionadded` on the same line as the description.
 * If multiple option descriptions in close proximity would have
   the same ..versionadded directive, consider adding a single
   directive after the list, mentioning all added options.
 * For compact value lists and sub-option lists, put a single
  `versionadded` directive after the list mentioning all additions.
 * When a change is described in a single paragraph, put
   `versionadded` into that paragraph.
 * When only part of the paragraph has changed, separate the changed
   part if it doesn't break the flow. Otherwise, write a follow-up
   clarification paragraph and apply version directive to that.
 * When multiple version directives are close by, order earlier
   additions before later additions.
 * Indent related lists and code blocks to include them in the scope
   of `versionadded` directive.

Issue: #19715

1 files changed, 4 insertions, 0 deletions

diff --git a/Help/command/separate_arguments.rst b/Help/command/separate_arguments.rst
index 69fb726..f66af35 100644
--- a/Help/command/separate_arguments.rst
+++ b/Help/command/separate_arguments.rst
@@ -32,10 +32,14 @@ be one of the following keywords:
   MSDN article `Parsing C Command-Line Arguments`_ for details.
 
 ``NATIVE_COMMAND``
+  .. versionadded:: 3.9
+
   Proceeds as in ``WINDOWS_COMMAND`` mode if the host system is Windows.
   Otherwise proceeds as in ``UNIX_COMMAND`` mode.
 
 ``PROGRAM``
+  .. versionadded:: 3.19
+
   The first item in ``<args>`` is assumed to be an executable and will be
   searched in the system search path or left as a full path. If not found,
   ``<variable>`` will be empty. Otherwise, ``<variable>`` is a list of 2