add 'visible' option i TopBar docs (#6147)

Co-authored-by: Guy Carmeli <guyca@users.noreply.github.com>

website/api/options-stack.mdx

 };
 ```
 
+### `visible`
+
+Determines if TopBar is visible or not.
+
+| Type    | Required | Platform |
+| ------- | -------- | -------- |
+| boolean | No       | Both     |
+
 ### `animate`
 
 Determines if changing the TopBar visibility will be animated or not.