doc: fix nits in esm.md
Checklist
-
documentation is changed or added -
commit message follows commit guidelines
Affected core subsystem(s)
doc
To ease review, this PR is splitted in 2 commits:
- Fix nits.
- Wrap long lines.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
doc
To ease review, this PR is splitted in 2 commits: