Documentation/rtla: Add include common_appendix.rst

Add include common_appendix.rst into
Documentation/tools/rtla/rtla-timerlat-hist.rst - the only file of
rtla-*.rst still without common_appendix.rst.

Signed-off-by: Costa Shulyupin <costa.shul@redhat.com>
Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250608104437.753708-2-costa.shul@redhat.com

Author: makelinux

Documentation/tools/rtla/rtla-timerlat-hist.rst

@@ -107,3 +107,5 @@ SEE ALSO
 AUTHOR
 ======
 Written by Daniel Bristot de Oliveira <bristot@kernel.org>
+
+.. include:: common_appendix.rst