Rollup merge of #133557 - Monadic-Cat:small_doc_fixes, r=bjorn3

Small doc fixes in `rustc_codegen_ssa`

I'm trying to make a toy codegen backend for `rustc`, and I got confused for a few minutes about what `codegen_backend` was referring to in the `CodegenBackend::join_codegen` docs.

Experimentally, it looks like the result of `CodegenBackend::codegen_crate` is passed to `CodegenBackend::join_codegen`, so this updates the docs to refer to that. This time using intra-doc links to hopefully cause people to notice if that gets out of date again.

Also, added another intra-doc link nearby, on `CodegenBackend::link`, for the same reason.

Author: GuillaumeGomez

compiler/rustc_codegen_ssa/src/traits/backend.rs

@@ -71,19 +71,19 @@ pub trait CodegenBackend {
         need_metadata_module: bool,
     ) -> Box<dyn Any>;
 
-    /// This is called on the returned `Box<dyn Any>` from `codegen_backend`
+    /// This is called on the returned `Box<dyn Any>` from [`codegen_crate`](Self::codegen_crate)
     ///
     /// # Panics
     ///
-    /// Panics when the passed `Box<dyn Any>` was not returned by `codegen_backend`.
+    /// Panics when the passed `Box<dyn Any>` was not returned by [`codegen_crate`](Self::codegen_crate).
     fn join_codegen(
         &self,
         ongoing_codegen: Box<dyn Any>,
         sess: &Session,
         outputs: &OutputFilenames,
     ) -> (CodegenResults, FxIndexMap<WorkProductId, WorkProduct>);
 
-    /// This is called on the returned `CodegenResults` from `join_codegen`
+    /// This is called on the returned [`CodegenResults`] from [`join_codegen`](Self::join_codegen).
     fn link(
         &self,
         sess: &Session,