go/ast: fix godoc links

Change-Id: I374e169ea71dea209eb86dfc251c659153f6f7a7
Reviewed-on: https://go-review.googlesource.com/c/go/+/777560
Reviewed-by: Alan Donovan <adonovan@google.com>
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Alan Donovan <adonovan@google.com>

src/go/ast/ast.go

@@ -6,8 +6,8 @@
 // packages.
 //
 // Syntax trees may be constructed directly, but they are typically
-// produced from Go source code by the parser; see the ParseFile
-// function in package [go/parser].
+// produced from Go source code by the parser; see the
+// [go/parser.ParseFile] function.
 package ast
 
 import (
@@ -1110,7 +1110,7 @@ func (p *Package) End() token.Pos { return token.NoPos }
 // not handwritten, by detecting the special comment described
 // at https://go.dev/s/generatedcode.
 //
-// The syntax tree must have been parsed with the [parser.ParseComments] flag.
+// The syntax tree must have been parsed with the [go/parser.ParseComments] flag.
 // Example:
 //
 //	f, err := parser.ParseFile(fset, filename, src, parser.ParseComments|parser.PackageClauseOnly)

src/go/ast/scope.go

@@ -79,11 +79,11 @@ func (s *Scope) String() string {
 // refers to a field of T, whereas for the other types it refers to a
 // value in the environment.
 //
-// New programs should set the [parser.SkipObjectResolution] parser
+// New programs should set the [go/parser.SkipObjectResolution] parser
 // flag to disable syntactic object resolution (which also saves CPU
 // and memory), and instead use the type checker [go/types] if object
 // resolution is desired. See the Defs, Uses, and Implicits fields of
-// the [types.Info] struct for details.
+// the [go/types.Info] struct for details.
 type Object struct {
 	Kind ObjKind
 	Name string // declared name