Update src/a2a/server/apps/jsonrpc/fastapi_app.py

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: ianchi

src/a2a/server/apps/jsonrpc/fastapi_app.py

@@ -186,7 +186,7 @@ def build(
             rpc_url: The URL for the A2A JSON-RPC endpoint.
             extended_agent_card_url: The URL for the authenticated extended agent card endpoint.
             dependencies: Optional sequence of FastAPI dependencies (e.g.
-                `[Security(get_current_active_user, scopes=["items"])]`)
+                `[Security(get_current_active_user, scopes=["a2a"])]`)
                 applied to authenticated routes. See
                 :meth:`add_routes_to_app`.
             **kwargs: Additional keyword arguments to pass to the FastAPI constructor.