Rollup merge of #64241 - adityaatluri:install-doc, r=Mark-Simulacrum
Rollup merge of #64241 - adityaatluri:install-doc, r=Mark-Simulacrum

[doc] Added more prereqs and note about default directory

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