Add full Sentry.init example

Co-authored-by: LucasZF <[email protected]>

Author: antonis

docs/platforms/react-native/user-feedback/configuration/index.mdx

@@ -246,17 +246,21 @@ You can also customize the Feedback Widget colors to match your app's theme. The
 ```javascript
 import * as Sentry from "@sentry/react-native";
 
-Sentry.feedbackIntegration({
-  colorScheme: 'system',
-  themeLight: {
-    foreground: '#ff0000',
-    background: '#00ff00',
-  },
-  themeDark: {
-    foreground: '#00ff00',
-    background: '#ff0000',
-  },
-}),
+Sentry.init({
+  integrations: [
+    Sentry.feedbackIntegration({
+      colorScheme: 'system',
+      themeLight: {
+        foreground: '#ff0000',
+        background: '#00ff00',
+      },
+      themeDark: {
+        foreground: '#00ff00',
+        background: '#ff0000',
+      },
+    }),
+  ],
+});
 ```
 
 The available theme options are: