Rollup merge of #106221 - Nilstrieb:rptr-more-like-ref-actually, r=compiler-errors

Rename `Rptr` to `Ref` in AST and HIR

The name makes a lot more sense, and `ty::TyKind` calls it `Ref` already as well.

compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs

@@ -2771,7 +2771,7 @@ impl<'v> Visitor<'v> for FindTypeParam {
         // and suggest `T: ?Sized` regardless of their obligations. This is fine because the errors
         // in that case should make what happened clear enough.
         match ty.kind {
-            hir::TyKind::Ptr(_) | hir::TyKind::Rptr(..) | hir::TyKind::TraitObject(..) => {}
+            hir::TyKind::Ptr(_) | hir::TyKind::Ref(..) | hir::TyKind::TraitObject(..) => {}
             hir::TyKind::Path(hir::QPath::Resolved(None, path))
                 if path.segments.len() == 1 && path.segments[0].ident.name == self.param =>
             {