Rollup merge of rust-lang#65620 - ryoqun:remove-unneeded-comment, r=varkor

Correctly note code as Ok not error for E0573

Hi, this is my first pull request to the Rust project.

The fix is very small one just to fix an oversight in a comment.

Namely, [this documentation PR](rust-lang#65234) added a longer explanation for E0573. It illustrated the error using erroneous/corrected contrasting examples. But it accidentally forgot to remove `// error` from the corrected example.

Sadly, I found the error after the PR got merged. [As suggested by the original author](https://github.com/rust-lang/rust/pull/65234/files#r336518549) of the PR, I created an PR to fix this.

Part of rust-lang#61137.

Author: JohnTitor

src/librustc_resolve/error_codes.rs

@@ -1682,7 +1682,7 @@ enum Wizard {
 }
 
 trait Isengard {
-    fn wizard(w: Wizard) { // error!
+    fn wizard(w: Wizard) { // ok!
         match w {
             Wizard::Saruman => {
                 // do something