Help: Revise docs on Scripting Commands

Revise docs for all "Scripting Commands", except four find_XXX
that use a macro suite of their own.

* Take full advantage of the improved syntax highlighting.
* Make consequential use of <..> placeholders.
* Clarify things here and there in the text.

Specific improvements to some command docs:

* "math": Correct description of novel hexadecimal capability.
* "if", "foreach", "while": Provide link to "endif" etc
* "foreach", "while": Mention "break" and "continue".
* "foreach": Simplify explanation of ``RANGE`` and ``IN`` signatures;
   advise against negative arguments or reverse ranges (compare issue #18461)
* "endif", "endfunction" etc: Explain that the argument is optional and
   maintained for compatibility only

1 files changed, 5 insertions, 5 deletions

diff --git a/Help/command/include.rst b/Help/command/include.rst
index eeca4c6..80968da 100644
--- a/Help/command/include.rst
+++ b/Help/command/include.rst
@@ -3,16 +3,16 @@ include
 
 Load and run CMake code from a file or module.
 
-::
+.. code-block:: cmake
 
-  include(<file|module> [OPTIONAL] [RESULT_VARIABLE <VAR>]
+  include(<file|module> [OPTIONAL] [RESULT_VARIABLE <var>]
                         [NO_POLICY_SCOPE])
 
-Load and run CMake code from the file given.  Variable reads and
+Loads and runs CMake code from the file given.  Variable reads and
 writes access the scope of the caller (dynamic scoping).  If ``OPTIONAL``
 is present, then no error is raised if the file does not exist.  If
-``RESULT_VARIABLE`` is given the variable will be set to the full filename
-which has been included or NOTFOUND if it failed.
+``RESULT_VARIABLE`` is given the variable ``<var>`` will be set to the
+full filename which has been included or ``NOTFOUND`` if it failed.
 
 If a module is specified instead of a file, the file with name
 ``<modulename>.cmake`` is searched first in :variable:`CMAKE_MODULE_PATH`,