ui/app: more documentation

Signed-off-by: Elias Naur <mail@eliasnaur.com>

ui/app/doc.go

@@ -55,5 +55,11 @@ For example, to display a blank but otherwise functional window:
 	}
 
 
+Event queue
+
+A Window's Queue method returns an input.Queue implementation that distributes
+incoming events to the input handlers declared in the latest call to Update.
+See the gioui.org/ui/input package for more information about input handlers.
+
 */
 package app

ui/app/window.go

@@ -159,7 +159,7 @@ func (w *Window) draw(size image.Point, frame *ui.Ops) {
 	w.updateAnimation()
 }
 
-// Invalidate the current window such that a UpdateEvent will be generated
+// Invalidate the window such that a UpdateEvent will be generated
 // immediately. If the window is inactive, the event is sent when the
 // window becomes active.
 func (w *Window) Invalidate() {