Updated installation.md

Have lightly edited this page. I think it could probably do with another look at some point as the instructions don't seem in a logical order.

Author: jo-unity

Documentation~/Installation.md

@@ -2,18 +2,18 @@
 
 ## Package
 
-The standard way to install post-processing or update it to the latest version is to use the package manager that comes with Unity 2018.1.
+To install post-processing or update to the latest version, use the Package Manager that comes with Unity 2018.1.
 
-> **Note:** if you already installed one of the scriptable render pipelines in your project then the post-processing package will already be installed.
+> **Note:** if you've installed one of the [scriptable render pipelines](https://docs.unity3d.com/Manual/ScriptableRenderPipeline.html) in your project then the post-processing package will already be installed.
 
-Go to `Window -> Package Manager`, switch the view from `In Project` to `All` and select `Postprocessing` in the list. In the right panel you'll find information about the package and a button to install or update to the latest available version for the currently running version of Unity.
+Go to `Window > Package Manager` and switch the view from `In Project` to `All`. Select `Postprocessing` in the list. In the right panel you'll find information about the package and a button to install or update to the latest available version for the version of Unity you are running.
 
 ## Sources
 
-You can, if you prefer, use the bleeding edge version of post-processing but be aware that only packaged versions are officially supported and things may break. If you're not familiar with Git we recommend you download [Github Desktop](https://desktop.github.com/) as it's easy to use and integrates well with Github.
+You can also use the bleeding edge version of post-processing, but only packaged versions are officially supported. If you're not familiar with Git, download [Github Desktop](https://desktop.github.com/) as it's easy to use and integrates well with Github.
 
-First, make sure you don't already have the `Postprocessing` package installed or it will conflict with a source installation. If you do, you can remove it using the package manager (`Window -> Package Manager`).
+Before installing, make sure you don't already have the `Postprocessing` package installed or it will conflict with a source installation. If you have the package already installed, you can remove it using the Package Manager (`Window > Package Manager`).
 
-Then you can use your Git client to clone the [post-processing repository](https://github.com/Unity-Technologies/PostProcessing) into your `Assets` folder. The development branch is `v2` and is conveniently set as the default so you don't need to pull any specific branch unless you want to follow a specific feature being developed in a separate branch.
+Use your Git client to clone the [post-processing repository](https://github.com/Unity-Technologies/PostProcessing) into your `Assets` folder. The development branch is `v2` and is set as the default so you don't need to pull any specific branches unless you want to follow a specific feature being developed in a separate branch.
 
-If you don't want to use a Git client you can also download a zip archive by clicking the green button that says "Clone or download" at the top of the repository and extract it into your project. The benefit of using Git is that you can quickly update to the latest revision without having to download / extract / replace the whole thing again. It's also more error-proof as it will handle moving & removing files correctly.
+If you don't want to use a Git client you can also download a zip archive by clicking the green button that says "Clone or download" at the top of the repository and extract it into your project. The benefit of using Git is that you can quickly update to the latest revision without having to download / extract / replace the whole package again. It's also more error-proof as it will handle moving and removing files correctly.