Fix the url to the quickstart of DocBook

Author: Jeroen

doc/reference/README.txt

@@ -30,7 +30,7 @@ DocBook Quick Start
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 Read this article on Code Project (by Jim Crafton)
 	"Documention with DocBook on Win32"
-	http://www.codeproject.com/winhelp/docbook_howto.asp
+	https://www.codeproject.com/Articles/4481/Documention-with-DocBook-on-Win
 
 
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