Fix typo createNavigatorX -> createXNavigator

Author: kacperkapusciak

versioned_docs/version-5.x/screen.md

@@ -6,7 +6,7 @@ sidebar_label: Screen
 
 `Screen` components are used to configure various aspects of screens inside a navigator.
 
-A `Screen` is returned from a `createNavigatorX` function:
+A `Screen` is returned from a `createXNavigator` function:
 
 ```js
 const Stack = createStackNavigator(); // Stack contains Screen & Navigator properties

versioned_docs/version-6.x/group.md

@@ -6,7 +6,7 @@ sidebar_label: Group
 
 `Group` components are used to group several [screens](screen.md) inside a navigator.
 
-A `Group` is returned from a `createNavigatorX` function:
+A `Group` is returned from a `createXNavigator` function:
 
 ```js
 const Stack = createStackNavigator(); // Stack contains Screen & Navigator properties

versioned_docs/version-7.x/group.md

@@ -6,7 +6,7 @@ sidebar_label: Group
 
 `Group` components are used to group several [screens](screen.md) inside a navigator.
 
-A `Group` is returned from a `createNavigatorX` function:
+A `Group` is returned from a `createXNavigator` function:
 
 ```js
 const Stack = createStackNavigator(); // Stack contains Screen & Navigator properties