Update and clarify aspects in documentation

[sadielbartholomew]

Minor updates to the CATS documentation, including:

• fix some typos appearing to the user. some misleading e.g. 'cpus' should be 'gpus' in the corresponding CLI argument description;
• clarify some statements which are somewhat misleading e.g. 'cats looks for a file named config.yaml in the current directory' when strictly it just needs a YAML extension so the same with .yml is also acceptable;
• update a code snippet implying that 'cats errors out' if no location is provided via CLI or configuration file, when actually at this stage CATS is more clever and will try to estimate location from the IP address.

Hopefully these are fairly self-explanatory suggestions, but please feel free to question.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.23%. Comparing base (31cfede) to head (715d4cb).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #111   +/-   ##
=======================================
  Coverage   89.23%   89.23%           
=======================================
  Files          14       14           
  Lines         548      548           
=======================================
  Hits          489      489           
  Misses         59       59           

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[andreww]

Looks good to me. One thing I'm unclear about is if the documentation on readthedocs will keep up with our main branch, or keeps versions of the documentation for releases, or what. Not an issue for this PR, but probably needs looking at.

Anyhow, committing this quickly seems sensible.

[sadielbartholomew]

Thanks @andreww, shall I merge, or wait for #110 to go in since we are touching some of the same lines (I am happy to resolve the conflict there)?

[andreww]

Go ahead and merge - that will tell us for sure what the merge conflicts are for #110. I think they would be easy to fix.