docs: Update model_builder.py to resolve warning in documentation build

[c0d33ngr]

Description

Added extra dashes under the last four Parameters in the model_builder.py

Related Issue

• Closes dashes under Parameters in model_builder.py are one too short #770
• Related to #

Checklist

• Checked that the pre-commit linting/style checks pass
• Included tests that prove the fix is effective or that the new feature works
• Added necessary documentation (docstrings and/or example notebooks)
• If you are a pro: each commit corresponds to a relevant logical change

Modules affected

• MMM
• CLV

Type of change

• New feature / enhancement
• Bug fix
• Documentation
• Maintenance
• Other (please specify):

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📚 Documentation preview 📚: https://pymc-marketing--797.org.readthedocs.build/en/797/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 33.83%. Comparing base (576cf45) to head (d090585).
Report is 183 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (576cf45) and HEAD (d090585). Click for more details.

HEAD has 2 uploads less than BASE

Flag	BASE (576cf45)	HEAD (d090585)
	3	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #797       +/-   ##
===========================================
- Coverage   93.86%   33.83%   -60.04%     
===========================================
  Files          28       28               
  Lines        2950     2950               
===========================================
- Hits         2769      998     -1771     
- Misses        181     1952     +1771     

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[wd60622]

Thanks @c0d33ngr!