`impl PartialEq<Punct> for char`; symmetry for #78636
`impl PartialEq<Punct> for char`; symmetry for #78636

Also fixes the "since" version of the original.

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