Robins install swift changes (#648)

* Lightly edited "getting started > installing swift" section for clarity and help developers to get started with documentation.

* made slight change to first sentence

* Removed "Swift scripts"

* Removed redundancy. Broke into two sentences.

* Update _includes/getting-started/_installing.md

Co-authored-by: Tim Condon <0xTim@users.noreply.github.com>

---------

Co-authored-by: Tim Condon <0xTim@users.noreply.github.com>

Author: RobinBateman808

_includes/getting-started/_installing.md

@@ -1,7 +1,9 @@
 ## Installing Swift
 
-If you don't have Swift installed, [install it first](/install).
+To kickstart your journey, [install Swift](/install) to begin using it on **macOS**, **Linux**, or **Windows**. 
 
-To test that you have Swift installed, run `swift --version` from your shell or terminal app.
+> Tip: To test that you have Swift installed, run `swift --version` from your shell or terminal app.
 
-Swift comes bundled with the [Swift Package Manager (SwiftPM)]({% link documentation/package-manager/index.md %}), which manages the distribution of your Swift code, and allows easy importing of other Swift packages into your apps.
+Swift comes bundled with the [Swift Package Manager (SwiftPM)]({% link documentation/package-manager/index.md %}) that manages the distribution of Swift code. It allows easy importing of other Swift packages into your applications and libraries, making it a valuable tool for any Swift developer.
+
+Swift is covered by the [Swift License](swift.org/LICENSE.txt).