fixed Typo

doc/PROTOCOL.md

@@ -449,7 +449,7 @@ JSON Response from the server (extended [Minimal Response]) containing:
 		"message": "<message>"
     }
    
-`status` indicates how the request has been fullfiled by the server. 
+`status` indicates how the request has been fulfilled by the server. 
 On`"success"`, the Client display nothing to the user. 
 On one of`"error"|"conflict"|"conflict_allow_force"` the Client must display `"<message>"` to the user.
 On `"conflict"` the Client opens the alert as modal dialog (user can't change anything on the form) with a 'reload current