Add new lint `doc_overindented_list_items` (#13711)

Add a new lint `doc_overindented_list_items` to detect and fix list
items
in docs that are overindented.

For example,

```rs
/// - first line
///      second line
fn foo() {}
```

this would be fixed to:

```rs
/// - first line
///   second line
fn foo() {}
```

This lint improves readabiliy and consistency in doc.

---

- \[x] Followed [lint naming conventions][lint_naming]
- \[x] Added passing UI tests (including committed `.stderr` file)
- \[x] `cargo test` passes locally
- \[x] Executed `cargo dev update_lints`
- \[x] Added lint documentation
- \[x] Run `cargo dev fmt`

[lint_naming]:
https://rust-lang.github.io/rfcs/0344-conventions-galore.html#lints

changelog: [`doc_overindented_list_items`]: Added a new lint that
detects overindented list items in docs
fixes: #13601

0 files changed, 0 insertions, 0 deletions