docs : Update docstrings for OpenAI base.py (#22221)

- [x] **PR title**: Update docstrings for OpenAI base.py
-**Description:** Updated the docstring of few OpenAI functions for a
better understanding of the function.
    - **Issue:** #21983

---------

Co-authored-by: Bagatur <baskaryan@gmail.com>

libs/community/langchain_community/agents/openai_assistant/base.py

@@ -61,7 +61,12 @@ def _get_openai_async_client() -> openai.AsyncOpenAI:
 def _convert_file_ids_into_attachments(file_ids: list) -> list:
     """
     Convert file_ids into attachments
-    File search and Code interpreter will be turned on by default
+    File search and Code interpreter will be turned on by default.
+
+    Args:
+        file_ids (list): List of file_ids that need to be converted into attachments.
+    Returns:
+        A list of attachments that are converted from file_ids.
     """
     attachments = []
     for id in file_ids:
@@ -77,7 +82,15 @@ def _convert_file_ids_into_attachments(file_ids: list) -> list:
 def _is_assistants_builtin_tool(
     tool: Union[Dict[str, Any], Type[BaseModel], Callable, BaseTool],
 ) -> bool:
-    """Determine if tool corresponds to OpenAI Assistants built-in."""
+    """
+    Determine if tool corresponds to OpenAI Assistants built-in.
+
+    Args:
+        tool : Tool that needs to be determined
+    Returns:
+        A boolean response of true or false indicating if the tool corresponds to
+        OpenAI Assistants built-in.
+    """
     assistants_builtin_tools = ("code_interpreter", "retrieval")
     return (
         isinstance(tool, dict)
@@ -93,6 +106,12 @@ def _get_assistants_tool(
 
     Note that OpenAI assistants supports several built-in tools,
     such as "code_interpreter" and "retrieval."
+
+    Args:
+        tool: Tools or functions that need to be converted to OpenAI tools.
+    Returns:
+        A dictionary of tools that are converted into OpenAI tools.
+
     """
     if _is_assistants_builtin_tool(tool):
         return tool  # type: ignore