Update layout-types.md

docs/docs/layout-types.md

 
 ```js
 Navigation.mergeOptions(componentId, {
-  bottomTas: visible: false,
+  bottomTabs: visible: false,
   ...Platform.select({ android: { drawBehind: true } })
 });
 ```
 Navigation.push(componentId, {
 	component: {
 	  name: 'pushedScreen',
-	  options: { bottomTas: visible: false }
+	  options: { bottomTabs: visible: false }
 	}
   });
 ```