Merge pull request #114 from JonathanLeban/patch-2

Update Phase1.md

com.unity.perception/Documentation~/Tutorial/Phase1.md

 This step prepares your project to render tailor-made images that will be later used for labeling the generated synthetic data.
 
 ### <a name="step-3">Step 3: Setup a Scene for Your Perception Simulation</a> 
-Simply put, in Unity, Scenes contain any object that exists in the world. This world can be a game, or in this case, a perception-oriented simulation. Every new project contains a Scene named `SampleScene`, which is automatically openned when the project is created. This Scenes comes with several objects and settings that we do not need, so let's create a new one. 
+Simply put, in Unity, Scenes contain any object that exists in the world. This world can be a game, or in this case, a perception-oriented simulation. Every new project contains a Scene named `SampleScene`, which is automatically opened when the project is created. This Scene comes with several objects and settings that we do not need, so let's create a new one. 
 
 * **Action**: In the _**Project**_ tab, right-click on the `Assets/Scenes` folder and click _**Create -> Scene**_. Name this new Scene `TutorialScene` and double-click on it to open it.