Revert the sic brace change

Author: dingo-d

wordpress-coding-standards/php.md

@@ -584,6 +584,6 @@ While this operator does exist in Core, it is often used lazily instead of doing
 
 Per [#22400](https://core.trac.wordpress.org/ticket/22400 "Remove all, or at least most, uses of extract() within WordPress"):
 
-> `extract()` is a terrible function that makes code harder to debug and harder to understand. We should discourage its (sic) use and remove all of our uses of it.
+> `extract()` is a terrible function that makes code harder to debug and harder to understand. We should discourage its [sic] use and remove all of our uses of it.
 
 Joseph Scott has [a good write-up of why it's bad](https://blog.josephscott.org/2009/02/05/i-dont-like-phps-extract-function/).