Geo: Clarify reverify and resync in troubleshooting documentation

Chloe Fonsrequested to merge
520358-update-resync-reverify-troubleshooting-docs into master

What does this MR do and why?

Restructures the "Resync and reverify multiple components" section to better explain how bulk actions work and improve clarity for customers troubleshooting Geo replication issues.

References

Geo Replicables: Explain technical details of b... (#520358)

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