urldata: spellfix comment

Reported-by: Melissa

lib/urldata.h

@@ -795,8 +795,8 @@ struct Curl_handler {
                                       gets a default */
 #define PROTOPT_NOURLQUERY (1<<6)   /* protocol can't handle
                                         url query strings (?foo=bar) ! */
-#define PROTOPT_CREDSPERREQUEST (1<<7) /* requires login creditials per request
-                                          as opposed to per connection */
+#define PROTOPT_CREDSPERREQUEST (1<<7) /* requires login credentials per
+                                          request instead of per connection */
 
 
 /* return the count of bytes sent, or -1 on error */