Rollup merge of #121792 - GuillaumeGomez:improve-suggestion, r=michaelwoerister

Improve renaming suggestion when item starts with underscore

Fixes https://github.com/rust-lang/rust/issues/121776.

It goes from:

```terminal
error[E0433]: failed to resolve: use of undeclared type `Foo`
 --> src/foo.rs:6:13
  |
6 |     let _ = Foo::Bar;
  |             ^^^ use of undeclared type `Foo`
  |
help: an enum with a similar name exists, consider changing it
  |
1 | enum Foo {
  |      ~~~
```

to:

```terminal
error[E0433]: failed to resolve: use of undeclared type `Foo`
 --> foo.rs:6:13
  |
6 |     let _ = Foo::Bar;
  |             ^^^ use of undeclared type `Foo`
  |
help: an enum with a similar name exists, consider renaming `_Foo` into `Foo`
  |
1 | enum Foo {
  |      ~~~

error: aborting due to 1 previous error
```

1 files changed, 1 insertions, 1 deletions

diff --git a/tests/ui/suggestions/silenced-binding-typo.stderr b/tests/ui/suggestions/silenced-binding-typo.stderr
index 8dbd94208d6..c362d00c713 100644
--- a/tests/ui/suggestions/silenced-binding-typo.stderr
+++ b/tests/ui/suggestions/silenced-binding-typo.stderr
@@ -4,7 +4,7 @@ error[E0425]: cannot find value `x` in this scope
 LL |     let _y = x;
    |              ^
    |
-help: a local variable with a similar name exists, consider changing it
+help: a local variable with a similar name exists, consider renaming `_x` into `x`
    |
 LL |     let x = 42;
    |         ~