Rollup merge of #69567 - matthiaskrgr:useless_fmt, r=nagisa

use .to_string() instead of format!() macro to create strings

handles what is left after https://github.com/rust-lang/rust/pull/69541

src/librustc_parse/parser/pat.rs

@@ -216,7 +216,7 @@ impl<'a> Parser<'a> {
             .span_suggestion(
                 seq_span,
                 "...or a vertical bar to match on multiple alternatives",
-                format!("{}", seq_snippet.replace(",", " |")),
+                seq_snippet.replace(",", " |"),
                 Applicability::MachineApplicable,
             );
         }