CTEST_CVS_CHECKOUT: Add deprecated directive to docs

This variable got introduced in CMake 2.4 and was documented as
deprecated in CMake 3.1.

Help/command/ctest_start.rst

diff --git a/Help/command/ctest_start.rst b/Help/command/ctest_start.rst
index 2d68a37..9c4e3dc 100644
--- a/Help/command/ctest_start.rst
+++ b/Help/command/ctest_start.rst
@@ -80,8 +80,8 @@
 However, for the sake of readability, it is recommended that you order your
 parameters in the order listed at the top of this page.
 
-If the :variable:`CTEST_CHECKOUT_COMMAND` variable (or the
-:variable:`CTEST_CVS_CHECKOUT` variable) is set, its content is treated as
+If the :variable:`CTEST_CHECKOUT_COMMAND` 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

Help/variable/CTEST_CVS_CHECKOUT.rst

diff --git a/Help/variable/CTEST_CVS_CHECKOUT.rst b/Help/variable/CTEST_CVS_CHECKOUT.rst
index 32cf9eb..442138f 100644
--- a/Help/variable/CTEST_CVS_CHECKOUT.rst
+++ b/Help/variable/CTEST_CVS_CHECKOUT.rst
@@ -1,6 +1,6 @@
 CTEST_CVS_CHECKOUT
 ------------------
 
-.. versionadded:: 3.1
+.. deprecated:: 3.1
 
-Deprecated.  Use :variable:`CTEST_CHECKOUT_COMMAND` instead.
+  Use :variable:`CTEST_CHECKOUT_COMMAND` variable instead.