Add `IPv4` and `IPv6` to the valid doc idents list
Add `IPv4` and `IPv6` to the valid doc idents list

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