Change default tab bar button from "Pressable" to "PlatformPressable"

Change default tab bar button from "Pressable" to "PlatformPressable"

- Fix inconsistent documentation between text and TypeScript definitions
- TypeScript correctly specifies PlatformPressable as default
- Aligns documentation with actual implementation
- Prevents confusion for developers using custom tabBarButton

Author: devJudicael

versioned_docs/version-7.x/bottom-tab-navigator.md

@@ -402,7 +402,7 @@ Accessibility label for the tab button. This is read by the screen reader when t
 
 #### `tabBarButton`
 
-Function which returns a React element to render as the tab bar button. It wraps the icon and label. Renders `Pressable` by default.
+Function which returns a React element to render as the tab bar button. It wraps the icon and label. Renders `PlatformPressable` by default.
 
 You can specify a custom implementation here: