Make it clickable

Markdown.md

@@ -4,6 +4,6 @@ In selected text inputs in ReCodEx web application Markdown markup language can
 
 A lot of cheatsheets and tutorials have been made on displaying Markdown features, here are few of them:
 
-* [http://commonmark.org/help/]()
-* [https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet]()
-* [https://guides.github.com/features/mastering-markdown/]()
+* [http://commonmark.org/help/](http://commonmark.org/help/)
+* [https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet](https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet)
+* [https://guides.github.com/features/mastering-markdown/](https://guides.github.com/features/mastering-markdown/)