Rollup merge of #76099 - camelid:patch-8, r=jyn514
Rollup merge of #76099 - camelid:patch-8, r=jyn514

Add info about `!` and `impl Trait`

Fixes #76094.

@rustbot modify labels: T-doc C-enhancement

graydon/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust