better highlight local frame attributes and methods

[bhazelton]

Description

The tutorial material on local frame calculations were all buried under "convenience methods" and it wasn't clear that you had to call update_position to get any of it to work.

Motivation and Context

Checklists:

Documentation Change Checklist:

• I have read the contribution guide.
• My code follows the code style of this project.
  Documentation change checklist:
• Any updated docstrings use the numpy docstring format.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (0a7f31c) to head (051a447).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #285   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            5         5           
  Lines         2120      2120           
  Branches       543       543           
=========================================
  Hits          2120      2120           

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