docs: recommendations for doing multi-repo PRs

[joanise]

PR Goal?

Provide recommendations to contributors on how to handle multi-repo PRs.

Fixes?

Fixes #406

Feedback sought?

I think my text is much too verbose. So:

• is this useful?
• What can be made more concise?
• What should just removed?

Priority?

normal

Confidence?

medium-low, see above

Version change?

no

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.45%. Comparing base (c80c8ef) to head (83536df).

❗ Current head 83536df differs from pull request most recent head ec17fa1. Consider uploading reports for the commit ec17fa1 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #410   +/-   ##
=======================================
  Coverage   73.45%   73.45%           
=======================================
  Files          43       43           
  Lines        2837     2837           
  Branches      467      467           
=======================================
  Hits         2084     2084           
  Misses        668      668           
  Partials       85       85           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[github-actions]

CLI load time: 0:00.30
Pull Request HEAD: ec17fa116bf8b840efd368c9bd051c18409a6ece
Imports that take more than 0.1 s:
import time: self [us] | cumulative | imported package

[roedoejet]

Wow - this is incredibly thorough. Great content @joanise ! One minor typo, otherwise it looks good to me and will be a good starting point for new contributors.