Rollup merge of #64142 - lzutao:fix-doc-cmp, r=jonas-schievink
Rollup merge of #64142 - lzutao:fix-doc-cmp, r=jonas-schievink

Fix doc links in `std::cmp` module

r? @jonas-schievink

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