Auto merge of #55224 - kryptan:master, r=matthewjasper

Use a keyword in raw identifier example

That's a very small documentation fix. The text says "you can now use keywords as identifiers" but example didn't use a keyword and would work without raw identifiers.

Author: bors

RELEASES.md

@@ -7,7 +7,7 @@ Language
   more powerful code generation, there is a [new chapter available][proc-macros]
   in Rust Programming Language book that goes further in depth.
 - [You can now use keywords as identifiers using the raw identifiers
-  syntax (`r#`).][53236] e.g. `let r#bool = true;`
+  syntax (`r#`).][53236] e.g. `let r#for = true;`
 - [Using anonymous parameters in traits is now deprecated with a warning and
   will be a hard error in the 2018 edition.][53272]
 - [You can now use `crate` in paths.][54404] This allows you to refer to the