CP-48198: `pre-commit.md`: Minor updates and cleanups

[bernhardkaindl]

Only a minor update and clean-up of documentation:

Move Comments from tests/unit/test_filter_xapi_clusterd_db.py

No code change, not even test code, only this file is in the PR:

• doc/pre-commit.md: Minor updates and cleanups

[codecov[bot]]

Codecov Report

Merging #101 (ddd995e) into master (d0e569d) will increase coverage by 10%. Report is 19 commits behind head on master. The diff coverage is n/a.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #101 +/- ## ======================================= + Coverage 88% 98% +10% ======================================= Files 18 18 Lines 2196 665 -1531 ======================================= - Hits 1939 654 -1285 + Misses 257 11 -246 ``` [see 1 file with indirect coverage changes](https://app.codecov.io/gh/xenserver/status-report/pull/101/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=xenserver) | [Flag](https://app.codecov.io/gh/xenserver/status-report/pull/101/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=xenserver) | Coverage Δ | | |---|---|---| | [python2.7](https://app.codecov.io/gh/xenserver/status-report/pull/101/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=xenserver) | `96% <ø> (+9%)` | :arrow_up: | | [python3.10.13](https://app.codecov.io/gh/xenserver/status-report/pull/101/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=xenserver) | `?` | | | [python3.10.14](https://app.codecov.io/gh/xenserver/status-report/pull/101/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=xenserver) | `100% <ø> (?)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=xenserver#carryforward-flags-in-the-pull-request-comment) to find out more.

[coveralls]

Pull Request Test Coverage Report for Build 8473686064

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 95.084%

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Totals
Change from base Build 8433749145:	0.0%
Covered Lines:	677
Relevant Lines:	712

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💛 - Coveralls