doc/rados: enhance "pools.rst"

Add a link to the instructions for modifying a user's caps for a given
pool. Add this link where it makes sense to add it. Add this link where
the reader would naturally want to have the link.

Signed-off-by: Zac Dover <[email protected]>
(cherry picked from commit e497970)

Author: zdover23

doc/rados/operations/pools.rst

@@ -319,6 +319,8 @@ To rename a pool, run a command of the following form:
 
 If you rename a pool for which an authenticated user has per-pool capabilities,
 you must update the user's capabilities ("caps") to refer to the new pool name.
+See :ref:`Modifying User Capabilities<modify-user-capabilities>` for
+instructions on updating a user's capabilities.
 
 
 Showing Pool Statistics