fix: fix imports for mcp registration in notebook (#1787)

# What does this PR do?
- as title

[//]: # (If resolving an issue, uncomment and update the line below)
[//]: # (Closes #[issue-number])

## Test Plan
notebook

[//]: # (## Documentation)

docs/getting_started.ipynb

@@ -2519,11 +2519,11 @@
       "outputs": [],
       "source": [
         "# NBVAL_SKIP\n",
-        "from llama_stack_client.types.shared_params.url import URL\n",
+        "from llama_stack_client.types.tool_group import McpEndpoint\n",
         "client.toolgroups.register(\n",
         "    toolgroup_id=\"mcp::filesystem\",\n",
         "    provider_id=\"model-context-protocol\",\n",
-        "    mcp_endpoint=URL(uri=\"http://localhost:8000/sse\"),\n",
+        "    mcp_endpoint=McpEndpoint(uri=\"http://localhost:8000/sse\"),\n",
         ")"
       ]
     },