Document platform support for Toast component

Author: jtomaszewski

src/components/ui/toast/docs/index.mdx

@@ -30,6 +30,10 @@ This is an illustration of **Toast** component.
 
 /// {Example:basic} ///
 
+### Platform Support
+
+**The Tooltip component is currently only supported on web platform**. Native mobile support (iOS/Android) is not available at this time. For more information, see [issue #1555](https://github.com/gluestack/gluestack-ui/issues/1555#issuecomment-1876602492).
+
 <br />
 
 ## Installation