Rollup merge of #82013 - Mark-Simulacrum:better-ci-error, r=jyn514
Rollup merge of #82013 - Mark-Simulacrum:better-ci-error, r=jyn514

Tell user how to fix CI file being not up to date

This hopefully should avoid future questions like in https://github.com/rust-lang/rust/pull/79979#issuecomment-776241356.

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