Auto merge of #10605 - yoav-lavi:patch-1, r=ehuss

Add caveat for covering features

This section explains the caveats and possible solutions for features, detailing the tooling needed to 100% cover such a project.

The need for this PR is based on a conversation with `@Eh2406.`

Moved this PR here based on `@Eh2406's` comment: https://github.com/rust-lang/reference/pull/1195#issuecomment-1108968173