Rollup merge of #53240 - llogiq:doc-num-swap-reverse, r=joshtriplett
Rollup merge of #53240 - llogiq:doc-num-swap-reverse, r=joshtriplett

Add individual documentation for <integer>`.swap_bytes`/.`reverse_bits`

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