Update referenceUrl for chat and execute endpoints

Changed the referenceUrl for both chat and execute endpoint metadata to use '/reference#tag/ai/post/ai/chat' for consistency with updated API documentation.

Author: 0xFirekeeper

apps/portal/src/app/nebula/api-reference/chat/EndpointMetadata.tsx

@@ -30,7 +30,7 @@ export function EndpointMetadata() {
         method: "POST",
         origin: "https://nebula-api.thirdweb.com",
         path: "/chat",
-        referenceUrl: "/reference#tag/ai/ai/chat",
+        referenceUrl: "/reference#tag/ai/post/ai/chat",
         request: {
           queryParameters: [],
           bodyParameters: [

apps/portal/src/app/nebula/api-reference/execute/EndpointMetadata.tsx

@@ -36,7 +36,7 @@ export function EndpointMetadata() {
         method: "POST",
         origin: "https://nebula-api.thirdweb.com",
         path: "/execute",
-        referenceUrl: "/reference#tag/ai/ai/execute",
+        referenceUrl: "/reference#tag/ai/post/ai/chat",
         request: {
           queryParameters: [],
           bodyParameters: [