Remove text around to_dict and JSON

[gadomski]

Related Issue(s):

• Closes Expectations of to_dict methods in returning JSON-typed values, regarding geometry #1047

Description:

Our to_dict methods do not always return objects that are strictly valid as JSON, e.g. they may contain tuples instead of lists. This PR updates all docstrings to remove references to returning valid JSON.

PR Checklist:

• pre-commit hooks pass locally
• Tests pass (run scripts/test)
• Documentation has been updated to reflect changes, if applicable
• This PR maintains or improves overall codebase code coverage.
• Changes are added to the CHANGELOG. See the docs for information about adding to the changelog.
• (once approved) Create a new issue to capture the useful discussion in Expectations of to_dict methods in returning JSON-typed values, regarding geometry #1047 around (de)serialization libraries

[gadomski]

Created #1092 to capture the serialization discussion.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.23%. Comparing base (3d258ab) to head (90aff00).
Report is 215 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1074   +/-   ##
=======================================
  Coverage   90.23%   90.23%           
=======================================
  Files          47       47           
  Lines        6236     6236           
  Branches      936      936           
=======================================
  Hits         5627     5627           
  Misses        428      428           
  Partials      181      181           

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