point to docs for ambig const/ty on intravisit

Author: BoxyUwU

compiler/rustc_hir/src/intravisit.rs

@@ -359,6 +359,9 @@ pub trait Visitor<'v>: Sized {
     /// All types are treated as ambiguous types for the purposes of hir visiting in
     /// order to ensure that visitors can handle infer vars without it being too error-prone.
     ///
+    /// See the doc comments on [`Ty`] for an explanation of what it means for a type to be
+    /// ambiguous.
+    ///
     /// The [`Visitor::visit_infer`] method should be overriden in order to handle infer vars.
     fn visit_ty(&mut self, t: &'v Ty<'v, AmbigArg>) -> Self::Result {
         walk_ty(self, t)
@@ -367,6 +370,9 @@ pub trait Visitor<'v>: Sized {
     /// All consts are treated as ambiguous consts for the purposes of hir visiting in
     /// order to ensure that visitors can handle infer vars without it being too error-prone.
     ///
+    /// See the doc comments on [`ConstArg`] for an explanation of what it means for a const to be
+    /// ambiguous.
+    ///
     /// The [`Visitor::visit_infer`] method should be overriden in order to handle infer vars.
     fn visit_const_arg(&mut self, c: &'v ConstArg<'v, AmbigArg>) -> Self::Result {
         walk_ambig_const_arg(self, c)