Update tab navigator docs to include accessibilityLabel and testID

Author: satya164

docs/bottom-tab-navigator.md

@@ -65,6 +65,14 @@ React Element or a function that given `{ focused: boolean, tintColor: string }`
 
 Title string of a tab displayed in the tab bar or React Element or a function that given `{ focused: boolean, tintColor: string }` returns a React.Node, to display in tab bar. When undefined, scene `title` is used. To hide, see `tabBarOptions.showLabel` in the previous section.
 
+#### `tabBarAccessibilityLabel`
+
+Accessibility label for the tab button. This is read by the screen reader when the user taps the tab. It's recommended to set this if you don't have a label for the tab.
+
+#### `tabBarTestID`
+
+ID to locate this tab button in tests.
+
 #### `tabBarOnPress`
 
 Callback to handle tap events; the argument is an object containing:

docs/material-bottom-tab-navigator.md

@@ -61,4 +61,22 @@ Color for the tab bar when the tab corresponding to the screen is active.
 
 #### `tabBarLabel`
 
-Title string of a tab displayed in the tab bar or React Element or a function that given `{ focused: boolean, tintColor: string }` returns a React.Node, to display in tab bar. When undefined, scene `title` is used. To hide, see `tabBarOptions.showLabel` in the previous section.
+Title string of a tab displayed in the tab bar or React Element or a function that given `{ focused: boolean, tintColor: string }` returns a React.Node, to display in tab bar. When undefined, scene `title` is used. To hide, see `tabBarOptions.showLabel` in the previous section.
+
+#### `tabBarAccessibilityLabel`
+
+Accessibility label for the tab button. This is read by the screen reader when the user taps the tab. It's recommended to set this if you don't have a label for the tab.
+
+#### `tabBarTestID`
+
+ID to locate this tab button in tests.
+
+#### `tabBarOnPress`
+
+Callback to handle tap events; the argument is an object containing:
+
+* the `previousScene: { route, index }` which is the scene we are leaving
+* the `scene: { route, index }` that was tapped
+* the `jumpToIndex` method that can perform the navigation for you
+
+Useful for adding a custom logic before the transition to the next scene (the tapped one) starts.

docs/material-top-tab-navigator.md

@@ -75,6 +75,14 @@ React Element or a function that given `{ focused: boolean, tintColor: string }`
 
 Title string of a tab displayed in the tab bar or React Element or a function that given `{ focused: boolean, tintColor: string }` returns a React.Node, to display in tab bar. When undefined, scene `title` is used. To hide, see `tabBarOptions.showLabel` in the previous section.
 
+#### `tabBarAccessibilityLabel`
+
+Accessibility label for the tab button. This is read by the screen reader when the user taps the tab. It's recommended to set this if you don't have a label for the tab.
+
+#### `tabBarTestID`
+
+ID to locate this tab button in tests.
+
 #### `tabBarOnPress`
 
 Callback to handle tap events; the argument is an object containing: