[[ Bug 22605 ]] Document iOS dark mode splash screen options

This patch documents the dark mode splash screen options which allow users to
present an appropriate splash screen depending on the system appearance.

Author: montegoulding

Documentation/guides/Deploying Your Application.md

@@ -338,11 +338,15 @@ Figure 10 – Standalone Settings – iOS Icons
 Figure 11 – Standalone Settings – iOS Splash
 
 |  |  |
-|---------------------------------|-------------------------------------------------------------------------------------------------------------|
-| **Launch Image**                | Choose a png image. This will be centered on screen. A 2732x2732 image will cover all current devices.      |
-| **2x Launch Image**             | Choose a png image. This will be centered on screen. A 5464x5464 image will cover all current devices.      |
-| **3x Launch Image**             | Choose a png image. This will be centered on screen. A 8196x8196 image will cover all current devices.      |
-| **Background Color**            | Choose a background color for transparent areas and/or areas of the screen the launch image does not cover. |
+|-------------------------------------------------|-------------------------------------------------------------------------------------------------------------|
+| **Launch Image**                                | Choose a png image. This will be centered on screen. |
+| **2x Launch Image**                             | Choose a png image. This will be centered on screen. |
+| **3x Launch Image**                             | Choose a png image. This will be centered on screen. |
+| **Dark Mode Launch Image**                      | Choose a png image for use in dark mode. This will be centered on screen. |
+| **Dark Mode 2x Launch Image**                   | Choose a png image for use in dark mode. This will be centered on screen. |
+| **Dark Mode 3x Launch Image**                   | Choose a png image for use in dark mode. This will be centered on screen. |
+| **Background Color**                            | Choose a background color for transparent areas and/or areas of the screen the launch image does not cover. |
+| **Use system background color**                 | Use the system background color instead of a chosen color. This will use a dark color in dark mode and  light color in light mode. |
 
 Related lessons: