doc/rbd: add mirroring troubleshooting info

Add a note to doc/rbd/rbd-mirroring.rst that directs the reader to set
both "site-a" and "site-b" to have the same pool names in the event that
rbd throws the error message "failed to import peer bootstrap token".

This information was reported to the Ceph upstream by Petr Tlapa in June
of 2025, and credit for its development goes to Petr.

Signed-off-by: Zac Dover <[email protected]>

Author: zdover23

doc/rados/operations/pools.rst

@@ -306,6 +306,8 @@ following forms:
     ceph auth del {user}
 
 
+.. _rados_renaming_a_pool:
+
 Renaming a Pool
 ===============
 

doc/rbd/rbd-mirroring.rst

@@ -66,6 +66,9 @@ These pool configuration steps should be performed on both peer clusters. These
 procedures assume that both clusters, named "site-a" and "site-b", are accessible
 from a single host for clarity.
 
+The pool must have the same name on both peer clusters. See :ref:`Renaming a
+Pool<rados_renaming_a_pool>` for instructions on renaming pools.
+
 See the `rbd`_ manpage for additional details of how to connect to different
 Ceph clusters.