Help: Convert CTest Script variable references to cross-references

In the ctest(1) manual and ctest_start() command documentation, convert
mentions of CTest Script variables to cross-references so they will be
rendered as links.

1 files changed, 5 insertions, 3 deletions

diff --git a/Help/command/ctest_start.rst b/Help/command/ctest_start.rst
index b5c7a17..d7472db 100644
--- a/Help/command/ctest_start.rst
+++ b/Help/command/ctest_start.rst
@@ -10,13 +10,15 @@ Starts the testing for a given model
 Starts the testing for a given model.  The command should be called
 after the binary directory is initialized.  If the 'source' and
 'binary' directory are not specified, it reads the
-CTEST_SOURCE_DIRECTORY and CTEST_BINARY_DIRECTORY.  If the track is
+:variable:`CTEST_SOURCE_DIRECTORY` and :variable:`CTEST_BINARY_DIRECTORY`.
+If the track is
 specified, the submissions will go to the specified track.  If APPEND
 is used, the existing TAG is used rather than creating a new one based
 on the current time stamp.
 
-If the ``CTEST_CHECKOUT_COMMAND`` variable (or the ``CTEST_CVS_CHECKOUT``
-variable) is set, its content is treated as command-line.  The command is
+If the :variable:`CTEST_CHECKOUT_COMMAND` variable
+(or the :variable:`CTEST_CVS_CHECKOUT` variable)
+is set, its content is treated as command-line.  The command is
 invoked with the current working directory set to the parent of the source
 directory, even if the source directory already exists.  This can be used
 to create the source tree from a version control repository.