Fix comment

Author: benvinegar

src/raven.js

@@ -1335,7 +1335,7 @@ Raven.prototype = {
         var status = request.status;
 
         // 400 - project_id doesn't exist or some other fatal
-        // 401 - nvalid/revoked dsn
+        // 401 - invalid/revoked dsn
         // 429 - too many requests
         if (!(status === 400 || status === 401 || status === 429))
             return;