Document CDN animated webp query param

Author: advaith1

docs/Reference.mdx

@@ -351,7 +351,7 @@ Discord uses ids and hashes to render images in the client. These hashes can be
 | Guild Scheduled Event Cover | guild-events/[scheduled_event_id](#DOCS_RESOURCES_GUILD_SCHEDULED_EVENT/guild-scheduled-event-object)/[scheduled_event_cover_image](#DOCS_RESOURCES_GUILD_SCHEDULED_EVENT/guild-scheduled-event-object).png                                                                                                                                                                   | PNG, JPEG, WebP      |
 | Guild Member Banner         | guilds/[guild_id](#DOCS_RESOURCES_GUILD/guild-object)/users/[user_id](#DOCS_RESOURCES_USER/user-object)/banners/[member_banner](#DOCS_RESOURCES_GUILD/guild-member-object).png \*                                                                                                                                                                                             | PNG, JPEG, WebP, GIF |
 
-\* In the case of endpoints that support GIFs, the hash will begin with `a_` if it is available in GIF format. (example: `a_1269e74af4df7417b13759eae50c83dc`)
+\* In the case of endpoints that support GIFs, the hash will begin with `a_` if it is available in GIF format. These images can also be retrieved as animated WebP using the `?animated=true` querystring parameter. (example: `a_1269e74af4df7417b13759eae50c83dc`)
 
 \*\* In the case of the Default User Avatar endpoint, the value for `index` depends on whether the user is [migrated to the new username system](#DOCS_CHANGE_LOG/unique-usernames-on-discord). For users on the new username system, `index` will be `(user_id >> 22) % 6`. For users on the *legacy* username system, `index` will be `discriminator % 5`.