[clang-tools-extra] Update clang tidy Contributing guide (PR #106672)

[via cfe-commits]

MichelleCDjunaidi wrote:

>From another pull #106675, why is this failing the build-bot? Any ideas?

```
-- Build files have been written to: /home/runner/work/llvm-project/llvm-project/clang-tools-extra-build
ninja: Entering directory `clang-tools-extra-build'
[1/2] Generating man Sphinx documentation for clang-tools into "/home/runner/work/llvm-project/llvm-project/clang-tools-extra-build/tools/clang/tools/extra/docs/man"
FAILED: tools/clang/tools/extra/docs/CMakeFiles/docs-clang-tools-man /home/runner/work/llvm-project/llvm-project/clang-tools-extra-build/tools/clang/tools/extra/docs/CMakeFiles/docs-clang-tools-man 
cd /home/runner/work/llvm-project/llvm-project/clang-tools-extra-build/tools/clang/tools/extra/docs && /usr/local/bin/cmake -E env /opt/hostedtoolcache/Python/3.11.9/x64/bin/sphinx-build -b man -d /home/runner/work/llvm-project/llvm-project/clang-tools-extra-build/tools/clang/tools/extra/docs/_doctrees-clang-tools-man -q -t builder-man -D version=20 -D release=20.0.0git -tPreRelease -W /home/runner/work/llvm-project/llvm-project/clang-tools-extra/docs /home/runner/work/llvm-project/llvm-project/clang-tools-extra-build/tools/clang/tools/extra/docs/man

Warning, treated as error:

Warning, treated as error:
/home/runner/work/llvm-project/llvm-project/clang-tools-extra/docs/clang-tidy/Contributing.rst:342:Error in "code-block" directive:
maximum 1 argument(s) allowed, 8 supplied.

.. code-block:: console
  clang-query> let c1 cxxRecordDecl()
  clang-query> match c1
[2/2] Generating html Sphinx documentation for clang-tools into "/home/runner/work/llvm-project/llvm-project/clang-tools-extra-build/tools/clang/tools/extra/docs/html"
FAILED: tools/clang/tools/extra/docs/CMakeFiles/docs-clang-tools-html /home/runner/work/llvm-project/llvm-project/clang-tools-extra-build/tools/clang/tools/extra/docs/CMakeFiles/docs-clang-tools-html 
cd /home/runner/work/llvm-project/llvm-project/clang-tools-extra-build/tools/clang/tools/extra/docs && /usr/local/bin/cmake -E env /opt/hostedtoolcache/Python/3.11.9/x64/bin/sphinx-build -b html -d /home/runner/work/llvm-project/llvm-project/clang-tools-extra-build/tools/clang/tools/extra/docs/_doctrees-clang-tools-html -q -t builder-html -D version=20 -D release=20.0.0git -tPreRelease -W /home/runner/work/llvm-project/llvm-project/clang-tools-extra/docs /home/runner/work/llvm-project/llvm-project/clang-tools-extra-build/tools/clang/tools/extra/docs/html

Warning, treated as error:
/home/runner/work/llvm-project/llvm-project/clang-tools-extra/docs/clang-tidy/Contributing.rst:342:Error in "code-block" directive:
maximum 1 argument(s) allowed, 8 supplied.

.. code-block:: console
  clang-query> let c1 cxxRecordDecl()
  clang-query> match c1
ninja: build stopped: subcommand failed.
```

https://github.com/llvm/llvm-project/pull/106672