Update (doc) comments

Several (doc) comments were super outdated or didn't provide enough context.

Some doc comments shoved everything in a single paragraph without respecting
the fact that the first paragraph should be a single sentence because rustdoc
treats these as item descriptions / synopses on module pages.

compiler/rustc_ast/src/ast.rs

@@ -303,10 +303,6 @@ impl TraitBoundModifiers {
     };
 }
 
-/// The AST represents all type param bounds as types.
-/// `typeck::collect::compute_bounds` matches these against
-/// the "special" built-in traits (see `middle::lang_items`) and
-/// detects `Copy`, `Send` and `Sync`.
 #[derive(Clone, Encodable, Decodable, Debug)]
 pub enum GenericBound {
     Trait(PolyTraitRef, TraitBoundModifiers),

compiler/rustc_ast/src/visit.rs

@@ -480,7 +480,7 @@ pub fn walk_use_tree<'a, V: Visitor<'a>>(
     try_visit!(visitor.visit_path(&use_tree.prefix, id));
     match use_tree.kind {
         UseTreeKind::Simple(rename) => {
-            // The extra IDs are handled during HIR lowering.
+            // The extra IDs are handled during AST lowering.
             visit_opt!(visitor, visit_ident, rename);
         }
         UseTreeKind::Glob => {}