fix(docs): fix indent typo in code snippet in human-in-the-loop.md (#4501)

docs/docs/agents/human-in-the-loop.md

@@ -126,7 +126,7 @@ def add_human_in_the_loop(
     *,
     interrupt_config: HumanInterruptConfig = None,
 ) -> BaseTool:
-   """Wrap a tool to support human-in-the-loop review.""" 
+    """Wrap a tool to support human-in-the-loop review.""" 
     if not isinstance(tool, BaseTool):
         tool = create_tool(tool)
 
@@ -235,4 +235,4 @@ for chunk in agent.stream(
 
 ## Additional resources
 
-* [Human-in-the-loop in LangGraph](../concepts/human_in_the_loop.md)
+* [Human-in-the-loop in LangGraph](../concepts/human_in_the_loop.md)