gopls/internal/golang: CodeAction(gopls.doc.features): update URL

Updates golang/go#68977

Change-Id: I3d540dfff0d0c27a66d5bdd14fff08bfe896aedc
Reviewed-on: https://go-review.googlesource.com/c/tools/+/690956
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Robert Findley <rfindley@google.com>

Author: adonovan

gopls/internal/golang/codeaction.go

@@ -461,11 +461,9 @@ func goSplitPackage(ctx context.Context, req *codeActionsRequest) error {
 // goplsDocFeatures produces "Browse gopls feature documentation" code actions.
 // See [server.commandHandler.ClientOpenURL] for command implementation.
 func goplsDocFeatures(ctx context.Context, req *codeActionsRequest) error {
-	// TODO(adonovan): after the docs are published in gopls/v0.17.0,
-	// use the gopls release tag instead of master.
 	cmd := command.NewClientOpenURLCommand(
 		"Browse gopls feature documentation",
-		"https://github.com/golang/tools/blob/master/gopls/doc/features/index.md")
+		"https://go.dev/gopls/features")
 	req.addCommandAction(cmd, false)
 	return nil
 }