docs: add docs url of the rule match-with-fex

Author: dukeluo

lib/rules/match-with-fex.js

@@ -18,7 +18,7 @@ module.exports = {
         'The folder should match the naming pattern specified by the file extension',
       category: 'Layout & Formatting',
       recommended: false,
-      url: null, //TODO URL to the documentation page for this rule
+      url: 'https://github.com/DukeLuo/eslint-plugin-check-folder/blob/main/docs/rules/match-with-fex.md',
     },
     fixable: null,
     schema: [