DOCSP-45424 Incorrect information in editable field in OM 8 Docs (#623)

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Changes the "editable" field for S3 Endpoint from "yes" to "no". 

TODO: Need to backport the addition of the "editable" column on the
table to v7.0 (don't need 6.0 as it will be EOL soon)

- [DOCSP-45424](https://jira.mongodb.org/browse/DOCSP-45424)
-
[STAGING](https://deploy-preview-623--10gen-docs-ops-manager.netlify.app/tutorial/manage-s3-blockstore-storage/#update-any-editable-values-that-need-to-be-changed)

- [LATEST BUILD
LOG](https://app.netlify.com/sites/10gen-docs-ops-manager/deploys/6761b6be38c3120008525354)

### 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: amalhotra-mdb

source/includes/steps-admin-edit-s3-blockstore.yaml

@@ -49,7 +49,7 @@ content: |
 
      * - S3 Endpoint
        - Required
-       - yes
+       - no
        - Type the |url| for this |s3| bucket.