style(xatu): clarify manual inherit diagnostic

src/xatu/rules/manual_inherit.rs

@@ -15,7 +15,7 @@ impl NodeRule for ManualInherit {
 
     fn check(node: &Self::Node) -> Option<&'static str> {
         if node.key == node.value {
-            Some("This assignment is better written with `inherit`")
+            Some("Use `inherit` for this assignment")
         } else {
             None
         }