pacific: doc/radosgw: refine "notification reliability"

[zdover23]

This commit refines the English in the "Notification Reliability" section of the notifications.rst page (the "Bucket Notifications" page). I have also added signposting structure.

Co-authored-by: Anthony D'Atri anthony.datri@gmail.com
Co-authored-by: Yuval Lifshitz ylifshit@redhat.com

Signed-off-by: Zac Dover zac.dover@gmail.com
(cherry picked from commit 8f7b57f)

Contribution Guidelines

• To sign and title your commits, please refer to Submitting Patches to Ceph.

• If you are submitting a fix for a stable branch (e.g. "pacific"), please refer to Submitting Patches to Ceph - Backports for the proper workflow.

Checklist

• Tracker (select at least one)
  • References tracker ticket
  • Very recent bug; references commit where it was introduced
  • New feature (ticket optional)
  • Doc update (no ticket needed)
  • Code cleanup (no ticket needed)
• Component impact
  • Affects Dashboard, opened tracker ticket
  • Affects Orchestrator, opened tracker ticket
  • No impact that needs to be tracked
• Documentation (select at least one)
  • Updates relevant documentation
  • No doc update is appropriate
• Tests (select at least one)
  • Includes unit test(s)
  • Includes integration test(s)
  • Includes bug reproducer
  • No tests

Show available Jenkins commands

• jenkins retest this please
• jenkins test classic perf
• jenkins test crimson perf
• jenkins test signed
• jenkins test make check
• jenkins test make check arm64
• jenkins test submodules
• jenkins test dashboard
• jenkins test dashboard cephadm
• jenkins test api
• jenkins test docs
• jenkins render docs
• jenkins test ceph-volume all
• jenkins test ceph-volume tox
• jenkins test windows

[zdover23]

jenkins retest this please

[zdover23]

Note to posterity: the pr-triage check failed when I first raised this PR. That's why I asked Jenkins to retest it. But the pr-triage check isn't a test that's required for documentation, so I'm proceeding with the merge.