[clang-tools-extra] [clang-tidy] Add new check 'misc-scope-reduction' (PR #175429)

[via cfe-commits]

github-actions[bot] wrote:

<!--LLVM CODE LINT COMMENT: doc8-->


:warning: RST documentation linter, doc8 found issues in your code. :warning:

<details>
<summary>
You can test this locally with the following command:
</summary>

```bash
doc8 -q clang-tools-extra/docs/clang-tidy/checks/misc/scope-reduction.rst clang-tools-extra/docs/clang-tidy/checks/list.rst --config clang-tools-extra/clang-tidy/doc8.ini
```

</details>

<details>
<summary>
View the output from doc8 here.
</summary>

```
clang-tools-extra/docs/clang-tidy/checks/misc/scope-reduction.rst:7: D001 Line too long
```


Note: documentation lines should be less than 80 characters wide.
</details>


https://github.com/llvm/llvm-project/pull/175429