Rollup merge of #137356 - nik-rev:FERRIS, r=compiler-errors

Ferris 🦀 Identifier naming conventions

You cannot use Ferris as an identifier in Rust, this code will suggest to correct the  🦀 to `ferris`:

```rs
fn main() {
  let  🦀 = 4;
}
```

But it also suggests to correct to `ferris` in these cases, too:

```rs
struct  🦀 {}
fn main() {}
```

^ suggests: `ferris`
~ with this PR: `Ferris`

```rs
static 🦀: &str = "ferris!";
fn main() {}
```

^ suggests: `ferris`
~ with this PR: `FERRIS`

This is my first pull requests here!

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