Add a heading for installation instructions

Author: satya164

versioned_docs/version-6.x/bottom-tab-navigator.md

@@ -12,6 +12,8 @@ A simple tab bar on the bottom of the screen that lets you switch between differ
   </video>
 </div>
 
+## Installation
+
 To use this navigator, ensure that you have [`@react-navigation/native` and its dependencies (follow this guide)](getting-started.md), then install [`@react-navigation/bottom-tabs`](https://github.com/react-navigation/react-navigation/tree/main/packages/bottom-tabs):
 
 ```bash npm2yarn

versioned_docs/version-6.x/drawer-navigator.md

@@ -12,6 +12,8 @@ Component that renders a navigation drawer which can be opened and closed via ge
   </video>
 </div>
 
+## Installation
+
 To use this navigator, ensure that you have [`@react-navigation/native` and its dependencies (follow this guide)](getting-started.md), then install [`@react-navigation/drawer`](https://github.com/react-navigation/react-navigation/tree/main/packages/drawer):
 
 ```bash npm2yarn

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

@@ -10,6 +10,8 @@ This wraps the [`BottomNavigation`](https://callstack.github.io/react-native-pap
 
 <img src="/assets/navigators/tabs/material-bottom-tabs.gif" style={{ width: '420px', maxWidth: '100%', margin: '16px 0' }} />
 
+## Installation
+
 To use this navigator, ensure that you have [`@react-navigation/native` and its dependencies (follow this guide)](getting-started.md), then install [`@react-navigation/material-bottom-tabs`](https://github.com/react-navigation/react-navigation/tree/main/packages/material-bottom-tabs):
 
 ```bash npm2yarn

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

@@ -14,6 +14,8 @@ This wraps [`react-native-tab-view`](https://github.com/react-native-community/r
   </video>
 </div>
 
+## Installation
+
 To use this navigator, ensure that you have [`@react-navigation/native` and its dependencies (follow this guide)](getting-started.md), then install [`@react-navigation/material-top-tabs`](https://github.com/react-navigation/react-navigation/tree/main/packages/material-top-tabs):
 
 ```bash npm2yarn

versioned_docs/version-6.x/native-stack-navigator.md

@@ -10,6 +10,8 @@ This navigator uses the native APIs `UINavigationController` on iOS and `Fragmen
 
 One thing to keep in mind is that while `createNativeStackNavigator` offers native performance and exposes native features such as large title on iOS etc., it isn't as customizable as [`createStackNavigator`](stack-navigator.md), So if you need more customization than what's possible in this navigator, consider using `createStackNavigator` instead - which is a more customizable JavaScript based implementation.
 
+## Installation
+
 To use this navigator, ensure that you have [`@react-navigation/native` and its dependencies (follow this guide)](getting-started.md), then install [`@react-navigation/native-stack`](https://github.com/react-navigation/react-navigation/tree/main/packages/native-stack):
 
 ```bash npm2yarn

versioned_docs/version-6.x/stack-navigator.md

@@ -16,6 +16,8 @@ By default the stack navigator is configured to have the familiar iOS and Androi
 
 One thing to keep in mind is that while `createStackNavigator` is extremely customizable, it's implemented in JavaScript. While it runs animations and gestures using natively, the performance may not be as fast as a native implementation. This may not be an issue for a lot of apps, but if you're experiencing performance issues during navigation, consider using [`createNativeStackNavigator`](native-stack-navigator.md) instead - which uses native navigation primitives.
 
+## Installation
+
 To use this navigator, ensure that you have [`@react-navigation/native` and its dependencies (follow this guide)](getting-started.md), then install [`@react-navigation/stack`](https://github.com/react-navigation/react-navigation/tree/main/packages/stack):
 
 ```bash npm2yarn