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]

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

@@           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

Flag	Coverage Δ
python2.7	96% <ø> (+9%)	⬆️
python3.10.13	?
python3.10.14	100% <ø> (?)

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[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