Rollup merge of #37913 - GuillaumeGomez:socket-v4, r=frewsxcv
Rollup merge of #37913 - GuillaumeGomez:socket-v4, r=frewsxcv

Add missing examples for SocketAddrV4

r? @steveklabnik

cc @frewsxcv

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