Kristee Langham

Linking and closing the following issues as they should be done along with this issue: [Document: External DB RDS](https://github.com/vitessio/website/issues/436) [Document: External DB Aurora](https://github.com/vitessio/website/issues/437) [Document: External DB CloudSQL](https://github.com/vitessio/website/issues/438)

also add hot row protection per issue https://github.com/vitessio/website/issues/366