[PR] :Added practical upgrade lessons learned that may help others [couchdb]

["remcovanvugt (via GitHub)" <gi...@apache.org>]

remcovanvugt opened a new pull request, #5407:
URL: https://github.com/apache/couchdb/pull/5407

   ## Overview
   
   I recently encountered a few practical hurdles when upgrading a real old 2.x cluster to 3.x, I guess a few notes in the documentation might help others in the same situation.
   
   ## Checklist
   
   - [ ] Code is written and works correctly
   - [ ] Changes are covered by tests
   - [ ] Any new configurable parameters are documented in `rel/overlay/etc/default.ini`
   - [X] Documentation changes were made in the `src/docs` folder
   - [ ] Documentation changes were backported (separated PR) to affected branches
   


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