Help: Improve formatting of variable documentation

Improve formatting, primarily by:

* Adding links to relevant commands, properties, generators, and so on.
* Converting code, symbols, paths, and so on to fixed-width fonts.
* Hard wrapping lines to 80 characters or less.

1 files changed, 16 insertions, 15 deletions

diff --git a/Help/variable/CPACK_SET_DESTDIR.rst b/Help/variable/CPACK_SET_DESTDIR.rst
index 69d82e6..27fd355 100644
--- a/Help/variable/CPACK_SET_DESTDIR.rst
+++ b/Help/variable/CPACK_SET_DESTDIR.rst
@@ -1,30 +1,31 @@
 CPACK_SET_DESTDIR
 -----------------
 
-Boolean toggle to make CPack use DESTDIR mechanism when packaging.
+Boolean toggle to make CPack use ``DESTDIR`` mechanism when packaging.
 
-DESTDIR means DESTination DIRectory.  It is commonly used by makefile
+``DESTDIR`` means DESTination DIRectory.  It is commonly used by makefile
 users in order to install software at non-default location.  It is a
 basic relocation mechanism that should not be used on Windows (see
-CMAKE_INSTALL_PREFIX documentation).  It is usually invoked like this:
+:variable:`CMAKE_INSTALL_PREFIX` documentation).  It is usually invoked like
+this:
 
 ::
 
  make DESTDIR=/home/john install
 
 which will install the concerned software using the installation
-prefix, e.g.  "/usr/local" prepended with the DESTDIR value which
-finally gives "/home/john/usr/local".  When preparing a package, CPack
+prefix, e.g. ``/usr/local`` prepended with the ``DESTDIR`` value which
+finally gives ``/home/john/usr/local``.  When preparing a package, CPack
 first installs the items to be packaged in a local (to the build tree)
-directory by using the same DESTDIR mechanism.  Nevertheless, if
-CPACK_SET_DESTDIR is set then CPack will set DESTDIR before doing the
+directory by using the same ``DESTDIR`` mechanism.  Nevertheless, if
+``CPACK_SET_DESTDIR`` is set then CPack will set ``DESTDIR`` before doing the
 local install.  The most noticeable difference is that without
-CPACK_SET_DESTDIR, CPack uses CPACK_PACKAGING_INSTALL_PREFIX as a
-prefix whereas with CPACK_SET_DESTDIR set, CPack will use
-CMAKE_INSTALL_PREFIX as a prefix.
+``CPACK_SET_DESTDIR``, CPack uses :variable:`CPACK_PACKAGING_INSTALL_PREFIX`
+as a prefix whereas with ``CPACK_SET_DESTDIR`` set, CPack will use
+:variable:`CMAKE_INSTALL_PREFIX` as a prefix.
 
-Manually setting CPACK_SET_DESTDIR may help (or simply be necessary)
-if some install rules uses absolute DESTINATION (see CMake INSTALL
-command).  However, starting with CPack/CMake 2.8.3 RPM and DEB
-installers tries to handle DESTDIR automatically so that it is seldom
-necessary for the user to set it.
+Manually setting ``CPACK_SET_DESTDIR`` may help (or simply be necessary)
+if some install rules uses absolute ``DESTINATION`` (see CMake
+:command:`install` command).  However, starting with CPack/CMake 2.8.3 RPM
+and DEB installers tries to handle ``DESTDIR`` automatically so that it is
+seldom necessary for the user to set it.