community[patch]: docstrings update (#20301)

Added missed docstrings. Format docstings to the consistent form.

libs/community/langchain_community/llms/loading.py

@@ -34,6 +34,7 @@ def load_llm_from_config(config: dict, **kwargs: Any) -> BaseLLM:
 
 
 def load_llm(file: Union[str, Path], **kwargs: Any) -> BaseLLM:
+    """Load LLM from a file."""
     # Convert file to Path object.
     if isinstance(file, str):
         file_path = Path(file)