Merge pull request #383 from ZaninAndrea/patch-1

typo correction

lib/renderer.js

@@ -56,7 +56,7 @@ default_rules.fence = function (tokens, idx, options, env, slf) {
     return highlighted + '\n';
   }
 
-  // If language exists, inject class gently, without mudofying original token.
+  // If language exists, inject class gently, without modifying original token.
   // May be, one day we will add .clone() for token and simplify this part, but
   // now we prefer to keep things local.
   if (info) {