fix: update links (#2557)

* Update index.md

Fixed Installation and First Steps links for package

* Update index.md

---------

Co-authored-by: Noel Stephens <[email protected]>

Author: s-omeilia-unity

com.unity.netcode.gameobjects/Documentation~/index.md

@@ -7,8 +7,8 @@ Netcode for GameObjects is a Unity package that provides networking capabilities
 See guides below to install Unity Netcode for GameObjects, set up your project, and get started with your first networked game:
 
 - [Documentation](https://docs-multiplayer.unity3d.com/netcode/current/about)
-- [Installation](https://docs-multiplayer.unity3d.com/netcode/current/migration/install)
-- [First Steps](https://docs-multiplayer.unity3d.com/netcode/current/tutorials/helloworld/helloworldintro)
+- [Installation](https://docs-multiplayer.unity3d.com/netcode/current/installation)
+- [First Steps](https://docs-multiplayer.unity3d.com/netcode/current/tutorials/get-started-ngo)
 - [API Reference](https://docs-multiplayer.unity3d.com/netcode/current/api/introduction)
 
 # Technical details
@@ -32,4 +32,4 @@ On the following runtime platforms:
 |June 3, 2021|Update document to acknowledge Unity min version change. Matches package version 0.2.0|
 |August 5, 2021|Update product/package name|
 |September 9,2021|Updated the links and name of the file.|
-|April 20, 2022|Updated links|
+|April 20, 2022|Updated links|