[clang-tools-extra] [llvm] [Github][CI] Introduce `doc8` to `code-lint-helper.py` (PR #172123)

[via llvm-commits]

github-actions[bot] wrote:

<!--LLVM CODE LINT COMMENT: clang-tidy-->


:warning: C/C++ code linter, clang-tidy found issues in your code. :warning:

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

```bash

git diff -U0 origin/main...HEAD -- clang-tools-extra/clang-tidy/objc/SuperSelfCheck.cpp |
python3 clang-tools-extra/clang-tidy/tool/clang-tidy-diff.py   -path build -p1 -quiet
```

</details>

<details>
<summary>
View the output from clang-tidy here.
</summary>

```
clang-tools-extra/clang-tidy/objc/SuperSelfCheck.cpp:102:66: error: expected ';' after expression [clang-diagnostic-error]
  102 |                                        StringRef("[super init]"))
      |                                                                  ^
      |                                                                  ;
```

</details>


https://github.com/llvm/llvm-project/pull/172123