Update E0253.rs

changed error text

Author: lukehinds

src/test/compile-fail/E0253.rs

@@ -16,6 +16,6 @@ mod foo {
 
 use foo::MyTrait::do_something;
     //~^ ERROR E0253
-    //~|NOTE not directly importable
+    //~|NOTE cannot be imported directly
 
 fn main() {}