Improve version deployment documentation

[anrossi]

Description

Improve the version deployment documentation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.79%. Comparing base (14810af) to head (3b4df79).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4646      +/-   ##
==========================================
- Coverage   87.22%   86.79%   -0.43%     
==========================================
  Files          56       56              
  Lines       17354    17354              
==========================================
- Hits        15137    15063      -74     
- Misses       2217     2291      +74     

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[nibanks]

I know it doesn't work this way today, but I think it's worth updating the settings code (in a future PR) to handle a more simpler configuration model, where only one of these has to be implemented; including the Enabled one. Thoughts?

[anrossi]

I think the risk of a single-list is that a deployment is made using the single-list model, and then we add QUIC 3 support, and the deployment either does the version rollout wrong, or the infrastructure isn't built to do the rollout, so they have to spend more time updating infrastructure and testing it to even do a rollout.

[anrossi]

I do think that setting any version list via registry should enable the version negotiation extension without the extra registry value.