Adding the Rust By Example documentation to the release process rust-lang/rust#46194

Author: projektir

release-process.md

@@ -15,6 +15,9 @@ From within the repo:
 $ cd src/doc/book
 $ git fetch origin
 $ git reset --hard origin/master
+$ cd ../rust-by-example
+$ git fetch origin
+$ git reset --hard origin/master
 $ cd ../reference
 $ git fetch origin
 $ git reset --hard origin/master