[docs] Fix typo AWS docs

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (23a8727) 86.17% compared to head (b08123e) 86.17%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #954 +/- ## ======================================= Coverage 86.17% 86.17% ======================================= Files 74 74 Lines 5720 5720 ======================================= Hits 4929 4929 Misses 791 791 ``` | [Flag](https://app.codecov.io/gh/chanzuckerberg/cellxgene-census/pull/954/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=chanzuckerberg) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/chanzuckerberg/cellxgene-census/pull/954/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=chanzuckerberg) | `86.17% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=chanzuckerberg#carryforward-flags-in-the-pull-request-comment) to find out more.

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