Auto merge of #143617 - aDotInTheVoid:devdesktoptestattr, r=Mark-Simulacrum

Run `tests/rustdoc-json/attrs/target_features` on all hosts.

Makes it more convenient to test rustdoc on non x86_64. I mainly care about the aarch64 dev-desktops.

This works because rustdoc uses all target features, not just that of the target.

Author: bors