fixed AV tutorial headers hierarchy; #435

[alvii147]

Pull Request Checklist

Below is a simple checklist but please do not hesitate to ask for assistance!

• Fork, clone, and checkout the newest version of the code
• Create a new branch
• Make necessary code changes
• Install black (i.e., python -m pip install black or conda install -c conda-forge black)
• Install flake8 (i.e., python -m pip install flake8 or conda install -c conda-forge flake8)
• Install pytest-cov (i.e., python -m pip install pytest-cov or conda install -c conda-forge pytest-cov)
• Run black . in the root stumpy directory
• Run flake8 . in the root stumpy directory
• Run ./setup.sh && ./test.sh in the root stumpy directory
• Reference a Github issue (and create one if one doesn't already exist)

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[alvii147]

Fix for #435

[codecov-commenter]

Codecov Report

Merging #436 (05c9871) into main (1a33e4d) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main      #436   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           35        35           
  Lines         2743      2743           
=========================================
  Hits          2743      2743           

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