docs: add instructions for async ESLint isPathIgnored

[ChrisSargent]

Fixes #936

[codecov]

Codecov Report

Merging #937 (8e2362d) into master (292e882) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #937   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           18        18           
  Lines          611       611           
  Branches       144       144           
=========================================
  Hits           611       611           

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[iiroj]

I can approve this, but it might be neat to hide the links behind some text, to make it more readable.

[ChrisSargent]

All done - also for the one above (it was the only one I checked hence why I didn't put them in proper links already :-)

[iiroj]

Thanks for the PR, @ChrisSargent !

[github-actions]

🎉 This PR is included in version 10.5.4 🎉

The release is available on:

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

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