Update background image aspect ratio in PhotoBooth documentation (#1450)

## Changes

<!-- Please summarize your changes. -->

The documentation states that 1024x768 is 16:9, but that is incorrect as
it is actually 4:3. This was likely a mistake.
The proper 16:9 resolution is 1024x576, which also aligns with Roblox’s
maximum supported size, as images are scaled down to a maximum dimension
of 1024 pixels.

<!-- Please link to any applicable information (forum posts, bug
reports, etc.). -->

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Author: RenanMsV

content/en-us/resources/modules/photo-booth.md

@@ -292,7 +292,7 @@ PhotoBooth.configure({
 setBackgrounds(backgrounds: `Library.table`)
 </figcaption>
 
-Overrides the default backgrounds provided by the photo booth. Background images should be at 16:9 aspect ratio (1024&times;768) for an optimal experience and their asset IDs should be included in the backgrounds array. 1–4&nbsp;(inclusive) backgrounds can be provided.
+Overrides the default backgrounds provided by the photo booth. Background images should be at 16:9 aspect ratio (1024&times;576) for an optimal experience and their asset IDs should be included in the backgrounds array. 1–4&nbsp;(inclusive) backgrounds can be provided.
 
 ```lua title="LocalScript"
 local ReplicatedStorage = game:GetService("ReplicatedStorage")