fix: formatting issues in docstrings (#32265)

Ensures proper reStructuredText formatting by adding the required blank
line before closing docstring quotes, which resolves the "Block quote
ends without a blank line; unexpected unindent" warning.

libs/cli/langchain_cli/integration_template/integration_template/document_loaders.py

@@ -61,6 +61,7 @@ class __ModuleName__Loader(BaseLoader):
         .. code-block:: python
 
             TODO: Example output
+
     """  # noqa: E501
 
     # TODO: This method must be implemented to load documents.

libs/cli/langchain_cli/integration_template/integration_template/tools.py

@@ -61,6 +61,7 @@ class __ModuleName__Tool(BaseTool):  # type: ignore[override]
         .. code-block:: python
 
             # TODO: output of invocation
+
     """  # noqa: E501
 
     # TODO: Set tool name and description