doc/rados/operations: add prompts to operating.rst

doc/rados/operations: add prompts to operating.rst

This commit adds ".. prompt:: bash $"-style prompts to operating.rst.
This brings this file up to the standard established in 2020 when
Kefu added support for the ".. prompt::" directive.

This commit is a part of an initiative to modernize the presentation
of all BASH commands in the RADOS documentation.

The progress of this project can be tracked here:
https://tracker.ceph.com/issues/57108

Signed-off-by: Zac Dover <zac.dover@gmail.com>
(cherry picked from commit 69d62c05ef0ac8b903944d9e8c8fe4fbb3f73275)