Rollup merge of #103254 - fmease:fix-24183, r=GuillaumeGomez

rustdoc: do not filter out cross-crate `Self: Sized` bounds

All type parameters **except `Self`** are implicitly `Sized` ([via](https://doc.rust-lang.org/nightly/std/marker/trait.Sized.html)). Previously, we disregarded the exception of `Self` and omitted cross-crate `Sized` bounds of *any* type parameter *including* `Self` when rendering.
From now on, we *do* render cross-crate `Self: Sized` bounds.

Most notably, in `std` we now finally properly render the `Sized` bound of the `Clone` trait as well as the `Self: Sized` bound on `Iterator::map`.

Fixes #24183.

``@rustbot`` label T-rustdoc A-cross-crate-reexports
r? rustdoc

1 files changed, 14 insertions, 0 deletions

diff --git a/src/test/rustdoc/inline_cross/auxiliary/issue-24183.rs b/src/test/rustdoc/inline_cross/auxiliary/issue-24183.rs
new file mode 100644
index 00000000000..e7a13acc6f8
--- /dev/null
+++ b/src/test/rustdoc/inline_cross/auxiliary/issue-24183.rs
@@ -0,0 +1,14 @@
+#![crate_type = "lib"]
+
+pub trait U/*: ?Sized */ {
+    fn modified(self) -> Self
+    where
+        Self: Sized
+    {
+        self
+    }
+
+    fn touch(&self)/* where Self: ?Sized */{}
+}
+
+pub trait S: Sized {}