Improve <ceph-mon-modify> command output

[Gabriel de Araújo Cabral]

Brief Description
-----------------
The following command modifies the value for both controllers and also for any other node (compute/storage):

$ system ceph-mon-modify controller-0 ceph_mon_gib=<value>

Although I don't understand the reason we need to inform the controller-0/controller-1 given that will change for all hosts, the output message seems incorrect as well:

Requests:

1. Can this NOTE be updated to something like: "ceph_mon_gib for hosts are changed"?

2. Also, maybe we can take the opportunity and update the "please follow...." part as well.
According to the guide, we only need to lock/unlock the nodes. My suggestion is to update this message to something like "you must lock and then unlock the host to complete configuring system" instead of asking the operator to open the guide.

Severity
--------
Minor

Steps to Reproduce
------------------
1. Use the ceph-mon-modify command on Storage/Standard lab

Expected Behavior
------------------
Request 1: The note informing the value has been updated for the storage/compute node as well.

Request 2: Also, instead of asking the operator to open the guide to complete the configuration, simply say the affected nodes need to be locked/unlocked.

Actual Behavior
----------------
Request 1: NOTE informing the value has been updated for both controllers only.

Request 2: Instruct the operator to open the guide to check that needs to lock/unlock.

Reproducibility
---------------
100%

System Configuration
--------------------
Standard/Storage

Branch/Pull Time/Commit
-----------------------
Load: 2022-06-04_20-00-09

Workaround
----------
NA

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/starlingx/config/+/869685
Committed: https://opendev.org/starlingx/config/commit/888727bbde99eae3ce6fc31d390fa7fd437fdf8c
Submitter: "Zuul (22348)"
Branch: master

commit 888727bbde99eae3ce6fc31d390fa7fd437fdf8c
Author: Gabriel de Araújo Cabral <email address hidden>
Date: Mon Jan 9 09:04:21 2023 -0500

    Improve <ceph-mon-modify> command output

    The 'system ceph-mon-modify <controller>
    ceph_mon_gib=<value>' command modifies the value not just for
    both controllers as the last output message was appointing. Now
    the text is more appropriate and less redundant.

    Test Plan:
    PASS: Command <ceph-mon-modify> checked in storage
    PASS: Command <ceph-mon-modify> checked in standard

    Closes-Bug: 2002416

    Signed-off-by: Gabriel de Araújo Cabral <email address hidden>
    Change-Id: Ic3ab8af422b11429ee92943f1cdd82578da993c5