Minor clarification.

pages.go

@@ -12,9 +12,9 @@ type page struct {
 	Visible bool      // Whether or not this page is visible.
 }
 
-// Pages is a container for other primitives often used as the application's
-// root primitive. It allows to easily switch the visibility of the contained
-// primitives.
+// Pages is a container for other primitives laid out on top of each other,
+// overlapping or not. It is often used as the application's root primitive. It
+// allows to easily switch the visibility of the contained primitives.
 //
 // See https://github.com/rivo/tview/wiki/Pages for an example.
 type Pages struct {