core[patch]: Update doc-strings in callbacks (#28073)

- Fix api docs

libs/core/langchain_core/callbacks/file.py

@@ -13,7 +13,8 @@ class FileCallbackHandler(BaseCallbackHandler):
     """Callback Handler that writes to a file.
 
     Parameters:
-        file: The file to write to.
+        filename: The file to write to.
+        mode: The mode to open the file in. Defaults to "a".
         color: The color to use for the text.
     """
 

libs/core/langchain_core/callbacks/manager.py

@@ -1298,7 +1298,7 @@ class CallbackManager(BaseCallbackManager):
         run_id: Optional[UUID] = None,
         **kwargs: Any,
     ) -> list[CallbackManagerForLLMRun]:
-        """Run when LLM starts running.
+        """Run when chat model starts running.
 
         Args:
             serialized (Dict[str, Any]): The serialized LLM.