Updating setup steps and index links

com.unity.perception/Documentation~/SetupSteps.md

 # Using Perception in your project
-* Clone the [Perception](https://github.com/Unity-Technologies/com.unity.perception) repository
-* Install and use Unity latest [2019.3 Unity editor](https://unity.com/releases/2019-3) 
-
+1. Clone the [Perception](https://github.com/Unity-Technologies/com.unity.perception) repository
+1. Install the latest [2019.3 Unity Editor](https://unity.com/releases/2019-3) 
 1. Create a new HDRP or URP project, or open an existing project
 2. Open `Window` ->  `Package Manager`
 	1. In the Package Manager window find and click the ***+*** button in the upper lefthand corner of the window

com.unity.perception/Documentation~/index.md

 # com.unity.perception
 The Perception package provides a toolkit for generating large-scale datasets for perception-based machine learning training and validation. It is focused on capturing ground truth for camera-based use cases for now and will ultimately expand to other forms of sensors and machine learning tasks.
 
-> com.unity.perception is in active development. Its features and API are subject to significant change as development progresses.
+> Perception is in active development. Its features and API are subject to significant change as development progresses.
 
 [Installation instructions](SetupSteps.md)