docs(platforms): fix platforms for a mothod

src/plugins/camera.ts

@@ -122,9 +122,10 @@ export class Camera {
    * Remove intermediate image files that are kept in temporary storage after calling camera.getPicture.
    * Applies only when the value of Camera.sourceType equals Camera.PictureSourceType.CAMERA and the Camera.destinationType equals Camera.DestinationType.FILE_URI.
    * @return Returns a Promise
-   * @platforms ['iOS']
    */
-  @Cordova()
+  @Cordova({
+    platforms: ['iOS']
+  })
   static cleanup(){};
 }