Tweak Model.profile docstring and type hint

[williambdean]

Description

Related Issue

• Closes #
• 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

Type of change

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

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📚 Documentation preview 📚: https://pymc--7795.org.readthedocs.build/en/7795/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.84%. Comparing base (618634b) to head (746f0f1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7795   +/-   ##
=======================================
  Coverage   92.84%   92.84%           
=======================================
  Files         107      107           
  Lines       18380    18380           
=======================================
  Hits        17065    17065           
  Misses       1315     1315           

Files with missing lines	Coverage Δ
pymc/model/core.py	93.02% <100.00%> (ø)

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