docs: fix broken Markdown link (issue #9125)

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Author: DivitJain26

docs/style-guides/javascript/README.md

@@ -3651,7 +3651,7 @@ This document may be reused under a [Creative Commons Attribution-ShareAlike Lic
 
 [idiomatic-js]: https://github.com/rwaldron/idiomatic.js/
 
-[popular-convention]: http://sideeffect.kr/popularconvention/#javascript
+[popular-convention]: https://github.com/airbnb/javascript
 
 [quality-guide]: https://github.com/bevacqua/js