Rollup merge of #82826 - pierwill:fix-IPv, r=JohnTitor
Rollup merge of #82826 - pierwill:fix-IPv, r=JohnTitor

(std::net::parser): Fix capitalization of IP version names

Also add some missing puctuation in doc and code comments.

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