Rollup merge of #38020 - GuillaumeGomez:udp-socket-doc, r=frewsxcv
Rollup merge of #38020 - GuillaumeGomez:udp-socket-doc, r=frewsxcv

Add part of missing UdpSocket's urls and examples

r? @frewsxcv

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