Updated CLI instructions

[aburrell]

Description

Fixes #141 by updating the documentation. Also points users to Issue #113, which would fix the issue more cleanly.

Type of change

Please delete options that are not relevant.

• This change requires a documentation update

How Has This Been Tested?

python -m apexpy -h

Test Configuration

• Operating system: OS X Ventura
• Python version number: (e.g., 3.10)
• Compiler with version number: (e.g. gfortran 14.2)
• Relevant local setup details: this branch

Checklist

• Make sure you are merging into the develop (not main) branch
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• Add a note to Changelog.rst, summarising the changes
• Add yourself to AUTHORS.rst and .zenodo.json

[coveralls]

Pull Request Test Coverage Report for Build 12551124226

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 99.695%

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Totals
Change from base Build 12551119687:	0.0%
Covered Lines:	981
Relevant Lines:	984

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💛 - Coveralls