chore: Add missing , to code snippet

argilla-frontend/docs/snippets/start_page.md

@@ -30,7 +30,7 @@ import argilla as rg
 client = rg.Argilla(
     [local_]api_url="[LOCAL_HOST]",
     [hf_]api_url="https://[HF_OWNER]-[HF_SPACE_NAME].hf.space",
-    api_key="[USER_API_KEY]"
+    api_key="[USER_API_KEY]",
     [hf_]headers={"Authorization": f"Bearer {HF_TOKEN}"}
 )
 ```