Auto merge of #148544 - matthiaskrgr:rollup-n9dqgwc, r=matthiaskrgr

Rollup of 8 pull requests

Successful merges:

 - rust-lang/rust#147994 (Deduplicate deprecation warning when using unit or tuple structs)
 - rust-lang/rust#148440 ([rustdoc search] Simplify itemTypes and filter "dependencies")
 - rust-lang/rust#148501 (triagebot: Create Zulip topics for libs backports)
 - rust-lang/rust#148517 (Remove no longer necessary lint allow)
 - rust-lang/rust#148518 (Unify the configuration of the compiler docs)
 - rust-lang/rust#148523 (miri subtree update)
 - rust-lang/rust#148525 (Fix ICE from lit_to_mir_constant caused by type error)
 - rust-lang/rust#148534 (Merge `Vec::push{,_mut}_within_capacity`)

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

rustc_public/src/lib.rs

@@ -7,10 +7,7 @@
 //! This API is still completely unstable and subject to change.
 
 #![allow(rustc::usage_of_ty_tykind)]
-#![doc(
-    html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/",
-    test(attr(allow(unused_variables), deny(warnings)))
-)]
+#![doc(test(attr(allow(unused_variables), deny(warnings), allow(internal_features))))]
 #![feature(sized_hierarchy)]
 //!
 //! This crate shall contain all type definitions and APIs that we expect third-party tools to invoke to