I don't really mind, but this is kind of a funny statement :) It's true that "The section has to do with automatic retry of non-idempotent requests", but that's because you renamed the section from "Automatically Retrying Requests in HTTP/2.0 :P

Using PING to do liveness detection (which might then be used as a signal to automatically retry) is something that definitely should be explained, and if you want to change this section to focus purely on non-idempotent requests, then I think it's advisable to move this text somewhere else rather than just deleting it. Up to you guys though.