Rollup merge of #53363 - llogiq:num-individual-nonzero-docs, r=steveklabnik
Rollup merge of #53363 - llogiq:num-individual-nonzero-docs, r=steveklabnik

add individual docs to `core::num::NonZero*`

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