Rollup merge of rust-lang#121107 - estebank:capitalization-suggestion…

…, r=michaelwoerister

Fix msg for verbose suggestions with confusable capitalization

When encountering a verbose/multipart suggestion that has changes that are only caused by different capitalization of ASCII letters that have little differenciation, expand the message to highlight that fact (like we already do for inline suggestions).

The logic to do this was already present, but implemented incorrectly.

tests/ui/match_str_case_mismatch.stderr

@@ -17,7 +17,7 @@ error: this `match` arm has a differing case than its expression
 LL |         "~!@#$%^&*()-_=+Foo" => {},
    |         ^^^^^^^^^^^^^^^^^^^^
    |
-help: consider changing the case of this arm to respect `to_ascii_lowercase`
+help: consider changing the case of this arm to respect `to_ascii_lowercase` (notice the capitalization difference)
    |
 LL |         "~!@#$%^&*()-_=+foo" => {},
    |         ~~~~~~~~~~~~~~~~~~~~