Extraneous wikilink in docs

editions/tw5.com/tiddlers/howtos/Improving TiddlyWiki Documentation.tid

@@ -7,7 +7,7 @@ Anyone can submit improvements to the TiddlyWiki documentation that appears on h
 
 # Create an account on https://github.com if you don't already have one
 # On http://tiddlywiki.com, click "edit" on the tiddler you want to improve
-# You should see a pink banner with the text: //Can you help us improve this documentation? Find out how to edit this tiddler on GitHub//
+# You should see a pink banner with the text: //Can you help us improve this documentation? Find out how to edit this tiddler on ~GitHub//
 # Click on the external link ...''this tiddler on ~GitHub''
 # A new browser tab should open ready to edit the tiddler on github.com
 # Below the edit box for the tiddler text you should see a box labelled ''Propose file change''