Grammar fix

Author: dingo-d

wordpress-coding-standards/php.md

@@ -6,7 +6,7 @@ While not all code may fully comply with these standards (yet), all newly commit
 
 Keep the following rules in mind when writing PHP code for WordPress, whether for core programming code, plugins, or themes.
 
-Also see [PHP Inline Documentation Standards](https://developer.wordpress.org/coding-standards/inline-documentation-standards/php/) for further guidelines.
+Also see the [PHP Inline Documentation Standards](https://developer.wordpress.org/coding-standards/inline-documentation-standards/php/) for further guidelines.
 
 ## Single and Double Quotes