docs(fmt): clarify runtime compatiblity

[kt3k]

closes #6647

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.74%. Comparing base (ce1ee56) to head (8902b89).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6648   +/-   ##
=======================================
  Coverage   94.74%   94.74%           
=======================================
  Files         574      574           
  Lines       46412    46412           
  Branches     6521     6521           
=======================================
+ Hits        43971    43974    +3     
+ Misses       2397     2395    -2     
+ Partials       44       43    -1     

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

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.