chore: add material top tabs missing props (react-navigation#1209)

* chore: add material top tabs missing props (tabBarGap, tabBarAndroidRipple)
* chore: add examples

Author: okwasniewski

versioned_docs/version-6.x/material-top-tab-navigator.md

@@ -295,13 +295,49 @@ Color for the icon and label in the active tab.
 
 Color for the icon and label in the inactive tabs.
 
+#### `tabBarGap`
+
+Spacing between the tab items in the tab bar.
+
+Example: 
+
+```js
+<Tab.Navigator
+  //...
+  screenOptions={{
+    tabBarGap: 10,
+  }}
+>
+</Tab.Navigator>
+```
+
+#### `tabBarAndroidRipple`
+
+Allows to customize the android ripple effect.
+
+Example: 
+
+```js
+<Tab.Navigator
+  //...
+  screenOptions={{
+    tabBarAndroidRipple: { borderless: false },
+  }}
+>
+</Tab.Navigator>
+```
+
 #### `tabBarPressColor`
 
-Color for material ripple (Android >= 5.0 only).
+Color for material ripple.
+
+Only supported on Android.
 
 #### `tabBarPressOpacity`
 
-Opacity for pressed tab (iOS and Android < 5.0 only).
+Opacity for pressed tab.
+
+Only supported on iOS.
 
 #### `tabBarBounces`