Fix confusing comment

wiki/templates/wiki/create.html

@@ -18,7 +18,7 @@
       // if downcode doesn't hit, the char will be stripped here
       s = s.replace(/[^-\w\s]/g, '');  // remove unneeded chars
       s = s.replace(/^\s+|\s+$/g, ''); // trim leading/trailing spaces
-      s = s.replace(/[-\s]+/g, '_');   // convert spaces to hyphens
+      s = s.replace(/[-\s]+/g, '_');   // convert spaces and hyphens to underscores
       s = s.toLowerCase();             // convert to lowercase
       return s.substring(0, num_chars);// trim to first num_chars chars
   }