Fix typo in URL document loader example (#10585)

- **Description:** Fix typo in URL document loader example
  - **Issue:** N/A
  - **Dependencies:** N/A
  - **Tag maintainer:** not urgent

libs/langchain/langchain/document_loaders/url.py

@@ -26,7 +26,7 @@ class UnstructuredURLLoader(BaseLoader):
     from langchain.document_loaders import UnstructuredURLLoader
 
     loader = UnstructuredURLLoader(
-        ursl=["<url-1>", "<url-2>"], mode="elements", strategy="fast",
+        urls=["<url-1>", "<url-2>"], mode="elements", strategy="fast",
     )
     docs = loader.load()