Rollup merge of #76883 - qlcom:master, r=Mark-Simulacrum
Rollup merge of #76883 - qlcom:master, r=Mark-Simulacrum

README.md: Remove prompts from code blocks

https://github.com/rust-lang/rust/issues/76863

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