help: Rewrite "Resolve a topic" documentation to be more complete.
help: Rewrite "Resolve a topic" documentation to be more complete.

Co-authored-by: Alya Abbott <41e8b4dad52149873713ec5c8285e9f95271de46@zulip.com>
Co-authored-by: Tim Abbott <d0224c9164b19e926c250294e7a569c6d5ad5163@zulipchat.com>

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