Update ai-gateway.yaml

update ai gateway changelog
-openrouter as new provider
-small capitalization mistake

Author: kathayl

src/content/changelogs/ai-gateway.yaml

@@ -5,10 +5,16 @@ productLink: "/ai-gateway/"
 productArea: Developer platform
 productAreaLink: /workers/platform/changelog/platform/
 entries:
+ - publish_date: "2024-11-28"
+    title: OpenRouter
+    description: |-
+      * **Configuration**: Added [OpenRouter](/ai-gateway/providers/openrouter/) as a new provider.
+  
   - publish_date: "2024-11-19"
-    title: WebsocketS API
+    title: Websockets API
     description: |-
       * **Configuration**: Added [WebSockets API](/ai-gateway/configuration/websockets-api/) which provides a single persistent connection, enabling continuous communication.
+  
   - publish_date: "2024-11-19"
     title: Authentication
     description: |-