fix(docs): fix the regex and examples in the monorepo documentation

[baluyotraf]

Description

The regex in the monorepo example seems to follow the Python formatting, but the toml text should follow the raw string instead (unless this library internally calls eval?).

Also the example does not follow regex format in the setting.

Checklist

• Add test cases to all the changes you introduce
• Run poetry all locally to ensure this change passes linter check and test
• Test the changes on the local machine manually
• Update the documentation for the changes

Expected behavior

Update the regex pattern and update the example regex.

Steps to Test This Pull Request

Additional context

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.55%. Comparing base (120d514) to head (8a30015).
Report is 592 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1398      +/-   ##
==========================================
+ Coverage   97.33%   97.55%   +0.21%     
==========================================
  Files          42       57      +15     
  Lines        2104     2656     +552     
==========================================
+ Hits         2048     2591     +543     
- Misses         56       65       +9     

Flag	Coverage Δ
unittests	97.55% <ø> (+0.21%)	⬆️

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[Lee-W]

Looks like our poetry ci command is not running commitizen correctly. 🤔 I just fixed the commit message

[Lee-W]

I think commitizen-branch was wrongly implemented. I create a draft PR to keep track of it and hope I can wrap it up some time...

#1400