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

Help/command/ctest_coverage.rst

@@ -37,10 +37,14 @@ The options are:
   ran without error and non-zero otherwise.
 
 ``CAPTURE_CMAKE_ERROR <result-var>``
+  .. versionadded:: 3.7
+
   Store in the ``<result-var>`` variable -1 if there are any errors running
   the command and prevent ctest from returning non-zero if an error occurs.
 
 ``QUIET``
+  .. versionadded:: 3.3
+
   Suppress any CTest-specific non-error output that would have been
   printed to the console otherwise.  The summary indicating how many
   lines of code were covered is unaffected by this option.