Astro cal header cleanup #712

[aneeshb97]

Describe your changes

Type of change

Please delete options that are not relevant (and this line).

• 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 not work as expected)

Reference any relevant issues (don't forget the #)

Checklist before requesting a review

• I have verified that all unit tests pass in a clean environment and added new unit tests, as appropriate
• I have checked that I am merging into the right branch
• I have checked the output of the latest Github Actions run associated with this PR and confirmed running pytest did not produce any warnings
• I have checked if my code modifies an existing step function or modifies the data format docs. If it does, I've added my PR to the list maintained here.

[semaphoreP]

Looks good!