fix(docs): correct outdated references to tool kinds (#49)

Author: twishabansal

src/toolbox_langchain_sdk/client.py

@@ -81,7 +81,7 @@ async def load_tool(self, tool_name: str) -> StructuredTool:
         Loads the tool, with the given tool name, from the Toolbox service.
 
         Args:
-            toolset_name: The name of the toolset to load.
+            tool_name: The name of the tool to load.
                 Default: None. If not provided, then all the tools are loaded.
 
         Returns: