DOCSP-42940 -- Add rolling restart note (#342)

Add rolling restart note.

- [DOCSP-number](https://jira.mongodb.org/browse/DOCSP-42940)
-
[STAGING](https://preview-mongodbjvincentmongodb.gatsbyjs.io/ops-manager/DOCSP-42940/tutorial/enable-ldap-authentication-for-group/#configure-the-ldap-authorization-settings-optional)

- [LATEST BUILD
LOG](https://workerpool-boxgs.mongodbstitch.com/pages/job.html?collName=queue&jobId=66d0f01bc87522bd3aa34b47)

### 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-source-enable-authentication.yaml

@@ -138,6 +138,9 @@ content: |
      retrieve all groups which that LDAP user possesses and transforms those
      groups into their equivalent MongoDB roles.
 
+     MongoDB processes restart in a rolling fashion when you apply 
+     these changes.
+
   Skip this step if you selected :guilabel:`Saslauthd` in the previous
   step.