Andrew Overton 4e245ac6dc [Multiple components] Miscellaneous doc updates
This PR closes out all current doc change requests.

Closes https://github.com/material-components/material-components-ios/pull/10181

COPYBARA_INTEGRATE_REVIEW=https://github.com/material-components/material-components-ios/pull/10181 from andrewoverton:dev-docs-03-15-cherry-pick 00414a4f89e39dfc8d47623ee95e0311db1c7ae7
PiperOrigin-RevId: 363178361
2021-03-16 07:30:36 -07:00
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