Auto merge of #34465 - frewsxcv:builder-name-example, r=GuillaumeGomez
Auto merge of #34465 - frewsxcv:builder-name-example, r=GuillaumeGomez

Add doc example for `std::thread::Builder::name`.

None

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