Rollup merge of #68651 - LeSeulArtichaut:doc-from-nonzero, r=steveklabnik
Rollup merge of #68651 - LeSeulArtichaut:doc-from-nonzero, r=steveklabnik

Document `From` implementation for NonZero nums

This is more of a nitpick than a real change in documentation. I did this for consistency with other documentation (namely Atomic integers).

Related to #51430

r? @steveklabnik

PS: I actually tested the code this time. My CPU died in the process, but I get to open a (hopefully 🤞) working PR

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