Fix link to emoji cheat sheet

doc/markdown/markdown.md

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 Table of Contents  
@@ -159,7 +158,7 @@ Emoji
 	If you are :new: to this, don't be :fearful:. You can easily join the emoji :circus_tent:. All you need to do is to :book: up on the supported codes.
-	Consult the [Emoji Cheat Sheet]( "http://www.emoji-cheat-sheet.com/") for a list of all supported emoji codes. :thumbsup: 
+	Consult the [Emoji Cheat Sheet](http://www.emoji-cheat-sheet.com/) for a list of all supported emoji codes. :thumbsup: 
 Sometimes you want to be :cool: and add some :sparkles: to your :speech_balloon:. Well we have a :gift: for you:
@@ -169,7 +168,7 @@ You can use it to point out a :bug: or warn about :monkey:patches. And if someon
 If you are :new: to this, don't be :fearful:. You can easily join the emoji :circus_tent:. All you need to do is to :book: up on the supported codes.
-Consult the [Emoji Cheat Sheet]( "http://www.emoji-cheat-sheet.com/") for a list of all supported emoji codes. :thumbsup: 
+Consult the [Emoji Cheat Sheet](http://www.emoji-cheat-sheet.com/) for a list of all supported emoji codes. :thumbsup: 
 <a name="special"/>
 Special GitLab References