Rollup merge of #108685 - est31:backticks_matchmaking, r=petrochenkov

Match unmatched backticks in compiler/

Found with GNU grep:
```
grep -rEn '^(([^`]*`){2})*[^`]*`[^`]*$' compiler/ | rg -v '\s*[//]?.{1,2}```'
```

compiler/rustc_infer/src/infer/error_reporting/mod.rs

@@ -1690,7 +1690,7 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
                                 format!("{name} is defined in the current crate")
                             } else {
                                 let crate_name = self.tcx.crate_name(defid.krate);
-                                format!("{name} is defined in crate `{crate_name}")
+                                format!("{name} is defined in crate `{crate_name}`")
                             };
                             diagnostic.span_note(def_span, msg);
                         };