Update docs to reflect changes in TICA cube format

[hmlewis-astro]

Update docs to reflect changes in TICA cube format

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (fe56d85) 94.45% compared to head (f613144) 94.45%.
Report is 1 commits behind head on main.

❗ Current head f613144 differs from pull request most recent head 013f80f. Consider uploading reports for the commit 013f80f to get more accurate results

Additional details and impacted files

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  Coverage   94.45%   94.45%           
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  Files           8        8           
  Lines        1443     1443           
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  Hits         1363     1363           
  Misses         80       80           

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[jaymedina]

Requesting a typo fix. Also, those numbers (15 mins and 45 mins) are outdated, and I think we should update them in case a user is trying to make their own cubes and find that their processing time is wildly different from what's documented: Could you update the processing time for a 64 GB machine for EM2 data? And then for that last sentence you can just put On a system with less memory [...], this time can increase significantly.

It says there are 2 files changed in this PR but I only see the index.rst changes, so I might have to do another review for the other file.

[jaymedina]

Thank you for doing this! Just some small typos and incomplete sentences, but no large structural changes required, this looks good.