Update React Native documentation to choose DevRev or system preferred theme

Author: dhananjayj-dev

fern/docs/pages/sdks/mobile/react-native/features.mdx

@@ -86,6 +86,14 @@ For scenarios where custom handling is needed, links from the support chat can b
 DevRevSDK.setInAppLinkHandler((url) => {
 	// Perform an action here.
 });
+```
+
+## Dynamic theme configuration
+
+The DevRev SDK allows you to configure the theme dynamically based on the system appearance, or use the theme configured on the DevRev portal. By default, the theme will be dynamic and follow the system appearance.
+
+```swift
+DevRev.setPrefersSystemTheme(value: boolean)
 ```
 
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