fix a bunch of minor typos in docs and a bug in setting up FHD cal objects.

[bhazelton]

Description

Fix a bunch of minor typos in docs and docstrings. I found these because @steven-murray pointed out a typo in a previous PR. When I searched on that typo I found a bunch more. Then I installed a spell checker plugin and found even more 🤦‍♀️

I even found a typo that caused a bug in setting up FHD cal objects.

I almost certainly missed some, but this is a good start.

Motivation and Context

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation change (documentation changes only)
• Version change
• Build or continuous integration change
• Other

Checklist:

• I have read the contribution guide.
• My code follows the code style of this project.

Bug fix checklist:

• My fix includes a new test that breaks as a result of the bug (if possible).
• I have updated the CHANGELOG.

Documentation change checklist:

• Any updated docstrings use the numpy docstring format.
• If this is a significant change to the readme or other docs, I have checked that they are rendered properly on ReadTheDocs. You can check this via the RTD CI build.

[bhazelton]

This is the only one that's not in docs or comments -- this is an actual bug.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.93%. Comparing base (a932d15) to head (8ea4069).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1676   +/-   ##
=======================================
  Coverage   99.93%   99.93%           
=======================================
  Files          67       67           
  Lines       22845    22845           
=======================================
  Hits        22831    22831           
  Misses         14       14           

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