Rollup merge of #104364 - petrochenkov:docice2, r=GuillaumeGomez

rustdoc: Resolve doc links in external traits having local impls

For external impls it was done in https://github.com/rust-lang/rust/pull/103192 right away, but the local impl case was forgotten.

Fixes https://github.com/rust-lang/rust/issues/104145.

src/test/rustdoc/intra-doc/issue-104145.rs

@@ -0,0 +1,14 @@
+// Doc links in `Trait`'s methods are resolved because it has a local impl.
+
+// aux-build:issue-103463-aux.rs
+
+extern crate issue_103463_aux;
+use issue_103463_aux::Trait;
+
+pub struct LocalType;
+
+impl Trait for LocalType {
+    fn method() {}
+}
+
+fn main() {}