updating api references

[jacoblogan]

Description of changes:

updating api references

staging site: https://update-api-docs.dcrd0hs2ef1n0.amplifyapp.com

api reference pages for smoke testing https://update-api-docs.dcrd0hs2ef1n0.amplifyapp.com/react/build-a-backend/auth/reference/ https://update-api-docs.dcrd0hs2ef1n0.amplifyapp.com/react/build-a-backend/storage/reference/ https://update-api-docs.dcrd0hs2ef1n0.amplifyapp.com/react/build-a-backend/add-aws-services/analytics/reference/ https://update-api-docs.dcrd0hs2ef1n0.amplifyapp.com/react/build-a-backend/add-aws-services/in-app-messaging/reference/ https://update-api-docs.dcrd0hs2ef1n0.amplifyapp.com/react/build-a-backend/add-aws-services/rest-api/reference/

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Instructions

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Which product(s) are affected by this PR (if applicable)?

• [ ] amplify-cli
• [ ] amplify-ui
• [ ] amplify-studio
• [ ] amplify-hosting
• [ ] amplify-libraries

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• [ ] JS
• [ ] Swift
• [ ] Android
• [ ] Flutter
• [ ] React Native

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Checks

• [ ] Does this PR conform to the styleguide?

• [ ] Does this PR include filetypes other than markdown or images? Please add or update unit tests accordingly.

• [ ] Are any files being deleted with this PR? If so, have the needed redirects been created?

• [ ] Are all links in MDX files using the MDX link syntax rather than HTML link syntax?
  ref: MDX: [link](https://docs.amplify.aws/) HTML: <a href="https://docs.amplify.aws/">link</a>

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