Add changelog for Discord Social SDK v1.6.12170 (#7901)

* Add changelog for Discord Social SDK v1.6.12170

Documents new features including custom invite banner images,
customizable application names in Rich Presence, Xbox GDK 2025.04
support, and iOS crash fix.

* Apply suggestion from @colinloretz

Co-authored-by: Colin Loretz <colin.loretz@discordapp.com>

* Review updates

---------

Co-authored-by: Colin Loretz <colin.loretz@discordapp.com>

Author: markmandel

docs/change-log/2025-10-15-discord-social-sdk-1.6.12170.md

@@ -0,0 +1,30 @@
+---
+title: "Discord Social SDK Release 1.6.12170"
+date: "2025-10-15"
+topics:
+  - "Discord Social SDK"
+---
+
+A new release of the Discord Social SDK is now available, with the following updates:
+
+## New Features
+
+This small update to v1.6 adds some highly requested features from our partners. We found some time to sneak them in…
+
+- You can now provide custom art to display as a banner image in game invites that appear in Discord. This is done one
+  of two ways:
+    - By specifying a URL or an `asset key` to an image in the `activity.assets.inviteCoverImage` parameter when
+      calling `Client::UpdateRichPresence`. This method even affords you the ability to set a unique image
+      on each invite if you want!
+    - By uploading cover image art in the `Rich Presence` tab in the Developer Portal for your Application. Note: This
+      will be used as the fallback image if you don’t specify one via `activity.assets.inviteCoverImage`
+- It’s now possible to customize the displayed name for your Application in Discord’s Rich Presence. To do so, set
+  the `activity.name` parameter when calling [`Client::UpdateRichPresence`]
+- Added support for Microsoft Xbox GDK version 2025.04
+- Fixed a crash when calling [`Client::GetUserGuilds`] on iOS devices
+
+<!-- Autogenerated Reference Links -->
+
+[`Client::GetUserGuilds`]: https://discord.com/developers/docs/social-sdk/classdiscordpp_1_1Client.html#aac1ec02df6074ed9213ce230e6a42fe1
+
+[`Client::UpdateRichPresence`]: https://discord.com/developers/docs/social-sdk/classdiscordpp_1_1Client.html#af0a85e30f2b3d8a0b502fd23744ee58e