Fixes #5866. Issue number in previous commit was wrong both in comments and...

Fixes #5866. Issue number in previous commit was wrong both in comments and commit message. See https://github.com/jquery/jquery/commit/0e5b341cc0f3f9bf0f6659e09704f2267cfdfdba for previous commit.

src/ajax.js

@@ -542,7 +542,7 @@ jQuery.extend({
 		};
 
 		// Remove hash character (#7531: and string promotion)
-		// Add protocol if not provided (#5856: IE7 issue with protocol-less urls)
+		// Add protocol if not provided (#5866: IE7 issue with protocol-less urls)
 		// We also use the url parameter if available
 		s.url = ( "" + ( url || s.url ) ).replace( rhash, "" ).replace( rprotocol, protocol + "//" );