Rollup merge of #53507 - phungleson:fix-impl-from-for-waker, r=cramertj
Rollup merge of #53507 - phungleson:fix-impl-from-for-waker, r=cramertj

Add doc for impl From for Waker

As part of issue #51430 (cc @skade).

The impl is very simple, so not sure if we need to go into any details.

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