fix navigationOptions->defaultNavigationOptions

Author: vonovak

website/versioned_docs/version-3.x/stack-navigator.md

@@ -48,7 +48,7 @@ Options for the router:
 * `initialRouteName` - Sets the default screen of the stack. Must match one of the keys in route configs.
 * `initialRouteParams` - The params for the initial route
 * `initialRouteKey` - Optional identifier of the initial route
-* `navigationOptions` - Default navigation options to use for screens
+* `defaultNavigationOptions` - Default navigation options to use for screens
 * `paths` - A mapping of overrides for the paths set in the route configs
 
 Visual options: