Fix BottomTabs documentation

title was renamed to text

docs/docs/layout-types.md

@@ -48,7 +48,7 @@ const bottomTabs = {
         children: [],
         options: {
           bottomTab: {
-            title: 'Tab 1',
+            text: 'Tab 1',
             icon: require('../images/one.png')
           }
         }
@@ -59,7 +59,7 @@ const bottomTabs = {
         name: 'secondTabScreen',
         options: {
           bottomTab: {
-            title: 'Tab 2',
+            text: 'Tab 2',
             icon: require('../images/two.png')
           }
         }

docs/docs/top-level-api.md

@@ -23,7 +23,7 @@ Navigation.setRoot({
           }],
           options: {
             bottomTab: {
-              title: 'Tab 1',
+              text: 'Tab 1',
               icon: require('../images/one.png'),
               testID: 'FIRST_TAB_BAR_BUTTON'
             }
@@ -38,7 +38,7 @@ Navigation.setRoot({
           },
           options: {
             bottomTab: {
-              title: 'Tab 2',
+              text: 'Tab 2',
               icon: require('../images/two.png'),
               testID: 'SECOND_TAB_BAR_BUTTON'
             }