DOCSP-39296 add additional prerequisites for Ops manager upgrade (#197)

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- [DOCSP-39296](https://jira.mongodb.org/browse/DOCSP-39296)
-
[STAGING](https://preview-mongodbkanchanamongodb.gatsbyjs.io/ops-manager/DOCSP-39296/tutorial/upgrade-ops-manager/#hardware-and-software-requirements)
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---------

Co-authored-by: corryroot <[email protected]>

Author: kanchana-mongodb

source/includes/prerequisites-onprem-upgrade.rst

@@ -5,6 +5,10 @@ Your servers must meet the :doc:`/core/requirements`.
 
 .. include:: /includes/admonitions/warning-follow-requirements.rst
 
+Ensure that all data-bearing members are running before you start the
+upgrade process. To determine the status of the replica set members, run
+:dbcommand:`replSetGetStatus`. 
+
 If your backing databases run the MMAPv1 storage engine, the upgrade
 process fails. |onprem| prompts you to
 :manual:`upgrade the storage engine for those backing databases to WiredTiger </tutorial/change-replica-set-wiredtiger>`.