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, 12 insertions, 11 deletions

diff --git a/Help/command/math.rst b/Help/command/math.rst
index ddb1ec6..8386aab 100644
--- a/Help/command/math.rst
+++ b/Help/command/math.rst
@@ -17,17 +17,18 @@ Supported operators are ``+``, ``-``, ``*``, ``/``, ``%``, ``|``, ``&``,
 ``^``, ``~``, ``<<``, ``>>``, and ``(...)``; they have the same meaning
 as in C code.
 
-Hexadecimal numbers are recognized when prefixed with ``0x``, as in C code.
-
-The result is formatted according to the option ``OUTPUT_FORMAT``,
-where ``<format>`` is one of
-
-``HEXADECIMAL``
-  Hexadecimal notation as in C code, i. e. starting with "0x".
-``DECIMAL``
-  Decimal notation. Which is also used if no ``OUTPUT_FORMAT`` option
-  is specified.
-
+.. versionadded:: 3.13
+  Hexadecimal numbers are recognized when prefixed with ``0x``, as in C code.
+
+.. versionadded:: 3.13
+  The result is formatted according to the option ``OUTPUT_FORMAT``,
+  where ``<format>`` is one of
+
+  ``HEXADECIMAL``
+    Hexadecimal notation as in C code, i. e. starting with "0x".
+  ``DECIMAL``
+    Decimal notation. Which is also used if no ``OUTPUT_FORMAT`` option
+    is specified.
 
 For example