Embedded App SDK 2.2 Changelog (#7753)

* Add changelog

* Update docs/change-log/2025-08-11-embedded-app-sdk-version-2.2.md

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

* newlines

* link and upcase

* Split versions

---------

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

Author: anthonydiscord

docs/change-log/2025-08-11-embedded-app-sdk-version-2.1-and-2.2.md

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+---
+title: "Embedded App SDK Version 2.1 & 2.2"
+date: "2025-08-11"
+topics:
+- "Activities"
+- "Embedded App SDK"
+---
+
+We've made a few improvements to the Embedded App SDK for version 2.2.0, here are the highlights:
+
+### Changes in version 2.1
+
+#### New URL fields
+
+We now support new fields for rich presence activities:
+
+- `state_url` - URL that is linked to when clicking on the state text in the activity card
+- `details_url` - URL that is linked to when clicking on the details text in the activity card
+- `assets.large_url` - URL that is linked to when clicking on the large image in the activity card
+- `assets.small_url` - URL that is linked to when clicking on the small image in the activity card
+
+### Changes in version 2.2
+
+#### patchUrlMappings
+
+In line with the [recent change](/docs/change-log#remove-proxy-from-discord-activity-proxy-path) to remove the `.proxy/` path from Discord Activity proxy URLs, the `patchUrlMappings` utility has been updated to generate simplified URLs by default. It will now create mappings without the `.proxy/` prefix.
+
+The Embedded App SDK is available via [npm](https://www.npmjs.com/package/@discord/embedded-app-sdk) and [GitHub](https://github.com/discord/embedded-app-sdk). You can check out our [installation guide and reference](/docs/developer-tools/embedded-app-sdk) to get started with it!