5a23efd31e
Also replace the version placeholder in rustc_attr Replace the version placeholder with the current version in the rustc_attr crate too so that users won't see the placeholder but instead the explicit version. This especially fixes the bug for rustdoc not showing it but instead the placeholder. Originally reported [here](https://rust-lang.zulipchat.com/#narrow/stream/241545-t-release/topic/libs.20stabilization.20placeholder/near/296057188). cc #100591 ![Screenshot_20220830_233727](https://user-images.githubusercontent.com/8872119/187548079-6207776b-4481-4351-afff-607f5b3fe03a.png)