docs: fix typo in USB overview (AEGHB-762)

[hasheddan]

Fixes a typo of "Full-Speed" in the USB docs.

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👋 Hello hasheddan, we appreciate your contribution to this project!

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[leeebo]

@hasheddan Thanks for the fix, there is another same error here, can you fix it together?

[hasheddan]

@leeebo absolutely -- done!

[leeebo]

sha=34dd18f78b95e3b51f1f80ef9999c6671abd9acf