Rollup merge of #153725 - ferrocene:jh/fix-x-test-no-doc, r=Kobzol

Fix that `./x test --no-doc` actually keeps the same behaviour for backwards compatability

In rust-lang/rust#153143 the `./x test --no-doc` flag was renamed to `--all-targets`.  I added a commit that keeps the `--no-doc` flag for backwards compatibility, but unfortunately I forgot to actually keep the behaviour the same, which is fixed by this PR.

r? @Kobzol

Author: JonathanBrouwer