Help: Remove empty literal block markup in RESOURCE target property

This was added accidentally by commit 456e0fb64f (Help: Improve
documentation formating, 2019-04-01).

Help/prop_tgt/RESOURCE.rst

@@ -11,7 +11,7 @@ directory (eg. ``Resources`` directory for macOS) inside the bundle.
 On non-Apple platforms these files may be installed using the ``RESOURCE``
 option to the :command:`install(TARGETS)` command.
 
-Following example of Application Bundle::
+Following example of Application Bundle:
 
 .. code-block:: cmake