Improve wording in the -{W,A,F,D} options

Fixes #28708.

src/librustc_driver/lib.rs

@@ -738,7 +738,7 @@ fn describe_lints(lint_store: &lint::LintStore, loaded_plugins: bool) {
               Allow <foo>
     -D <foo>           Deny <foo>
     -F <foo>           Forbid <foo> \
-              (deny, and deny all overrides)
+              (deny <foo> and all attempts to override)
 
 ");