docs(compatibility): Use patch versions

[MrSwitch]

Defines the specific patch versions of MySQL used by Aurora.

This should help engineers:

• Manage expectations about what compatible MySQL services, features etc...
• Understand that the versions of MySQL aren't changed in the lifetime of the Aurora version. Any patches to MySQL will not be applied to Aurora (this is as i understand it).
• Define their local development and test instances (outside of Aurora) to have corresponding MySQL server versions

[claytran]

Hi @MrSwitch,

Thank you for your feedback. I understand why you want to do this, but I don't think that we should specify exact MySQL Community patch releases. Aurora MySQL version 2 doesn't support all of the features of MySQL 5.7, and some work differently.

In the case of Aurora MySQL version 3, our minor versions correspond to different minor versions of MySQL Community 8.0. The functionality is also different from MySQL Community. It's better for customers to read our documentation to determine what's supported, rather than assuming it from the version number.

So I'm going to deny the pull request. Thanks again for your time on this.

Thanks, Clayton