DOCSP-45707 -- replace tabs with placeholder (#568)

- [DOCSP-number](https://jira.mongodb.org/browse/DOCSP-45707)
-
[STAGING](https://deploy-preview-568--10gen-docs-ops-manager.netlify.app/tutorial/upgrade-ops-manager/#std-label-upgrade-om-procedure)

### Self-Review Checklist

- [ ]
[Define](https://wiki.corp.mongodb.com/display/DE/Taxonomy+tagging+instructions)
taxonomy
[values](https://wiki.corp.mongodb.com/display/DE/Docs+Taxonomy) at top
of page.
- [ ] Add genre facets (tutorial or reference), as in this [example
PR](10gen/cloud-docs#5042).
- [ ] Add programmingLanguage (if necessary).
- [ ] Add meta keywords (if necessary).
- [ ] Resolve any new warnings or errors in the build.
- [ ] Proofread for spelling and grammatical errors.
- [ ] Check staging for rendering issues.
- [ ] Confirm links are working.

Author: jvincent-mongodb

source/includes/steps-upgrade-on-prem-with-rpm-packages.yaml

@@ -75,35 +75,21 @@ content: |
 
   To complete the upgrade:
 
-  a. Issue the following commands to move the old ``init`` files:
+  a. Replace the ``<old-version>`` placeholder and run the following commands to move the old ``init`` files:
 
-     .. tabs::
-
-        .. tab:: Upgrading to 6.0
-           :tabid: upgrade-6
-
-           .. code-block:: sh
-
-              sudo mv /etc/init.d/mongodb-mms /etc/init.d/mongodb-mms-5.0
-              sudo mv /etc/init.d/mongodb-mms-backup-daemon /etc/init.d/mongodb-mms-backup-daemon-5.0
-
-        .. tab:: Upgrading to 7.0
-           :tabid: upgrade-7
-     
-           .. code-block:: sh
+     .. code-block:: sh
 
-              sudo mv /etc/init.d/mongodb-mms /etc/init.d/mongodb-mms-6.0
-              sudo mv /etc/init.d/mongodb-mms-backup-daemon /etc/init.d/mongodb-mms-backup-daemon-6.0
+        sudo mv /etc/init.d/mongodb-mms /etc/init.d/mongodb-mms-<old_version>
+        sudo mv /etc/init.d/mongodb-mms-backup-daemon /etc/init.d/mongodb-mms-backup-daemon-<old_version>
 
-  #. Issue the following commands to symbolically link the |onprem|
+  b. Run the following commands to symbolically link the |onprem|
      files to their ``init`` files:
 
      .. code-block:: sh
 
         sudo ln -s /opt/mongodb/mms/bin/mongodb-mms /etc/init.d/mongodb-mms
         sudo ln -s /opt/mongodb/mms/bin/mongodb-mms-backup-daemon /etc/init.d/mongodb-mms-backup-daemon
 
-
 ---
 stepnum: 5
 level: 4