mod: cleanup TODO and outdated comments

src/event.zig

@@ -9,6 +9,9 @@ pub const SystemEvent = union(enum) {
     /// Quit event to signify the end of the event loop (rendering should stop afterwards)
     quit,
     /// Resize event to signify that the application should re-draw to resize
+    ///
+    /// Usually no `Container` nor `Element` should act on that event, as it
+    /// only serves for event based loops to force a re-draw with a new `Event`.
     resize,
     /// Error event to notify other containers about a recoverable error
     err: struct {