docs: add description about Opening PRs for Breaking Changes

[PKulkoRaccoonGang]

Description

Added information on where to open PRs containing Breaking Changes in new versions of Paragon (after the release of design tokens and Paragon 23).

Merge Checklist

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[openedx-webhooks]

Thanks for the pull request, @PKulkoRaccoonGang!

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.42%. Comparing base (8215809) to head (e6c8e9b).
Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3333   +/-   ##
=======================================
  Coverage   93.42%   93.42%           
=======================================
  Files         250      250           
  Lines        4515     4515           
  Branches     1055     1055           
=======================================
  Hits         4218     4218           
  Misses        294      294           
  Partials        3        3           

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

[brian-smith-tcril]

LGTM!

[openedx-semantic-release-bot]

🎉 This PR is included in version 23.0.0-alpha.7 🎉

The release is available on:

• npm package (@alpha dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[openedx-semantic-release-bot]

🎉 This PR is included in version 23.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[openedx-semantic-release-bot]

🎉 This PR is included in version 22.12.0 🎉

The release is available on:

• npm package (@release-22.x dist-tag)
• GitHub release

Your semantic-release bot 📦🚀