Auto merge of #95345 - dtolnay:escape0, r=Dylan-DPC

Debug print char 0 as '\0' rather than '\u{0}'

```rust
println!("{:?}", "foo\0");
```

- **Before:** `"foo\u{0}"`
- **After:** `"foo\0"`

```rust
println!("{:?}", '\0');
```

- **Before:** `'\u{0}'`
- **After:** `'\0'`

`'\0'` will be more recognizable to everyone than `'\u{0}'` because it's how we talk about character 0 in all of our docs and example code, such as https://doc.rust-lang.org/std/ffi/index.html, https://doc.rust-lang.org/std/ffi/struct.CStr.html, https://doc.rust-lang.org/std/ffi/struct.CString.html.

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