Rollup merge of #59685 - lzutao:patch-1, r=GuillaumeGomez
Rollup merge of #59685 - lzutao:patch-1, r=GuillaumeGomez

Add description for -Os and -Oz in rustc.1

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