Documentation/rv: Add sched pages to the indices

The pages Documentation/tools/rv/rv-mon-sched.rst and
Documentation/trace/rv/monitor_sched.rst were introduced but not
included in any index.

Add them to the respective indices.

Cc: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/20250327081240.46422-1-gmonaco@redhat.com


Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Fixes: 03abeaa6 ("Documentation/rv: Add docs for the sched monitors")
Signed-off-by: Gabriele Monaco <gmonaco@redhat.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>