Auto merge of #11601 - weihanglo:remove-rls, r=ehuss

doc(contrib): remove rls in release process

### What does this PR try to resolve?

Remove mentions of RLS from doc of release process. RLS is no longer required to test when bumping Cargo version in rust-lang/rust.

See:

- rust-lang/rust#100863
- https://blog.rust-lang.org/2022/07/01/RLS-deprecation.html

src/doc/contrib/src/process/release.md

@@ -47,7 +47,6 @@ subup --up-branch update-cargo \
  --test="src/tools/linkchecker tidy \
  src/tools/cargo \
  src/tools/rustfmt \
- src/tools/rls" \
  src/tools/cargo
 ```
 
@@ -61,8 +60,7 @@ subup --up-branch update-beta-cargo \
  --test="src/tools/linkchecker tidy \
  src/tools/cargo \
  src/tools/rustfmt \
- src/tools/rls" \
- rust-1.63.0:src/tools/cargo
+ rust-1.66.0:src/tools/cargo
 ```
 
 [@ehuss]: https://github.com/ehuss/