community: toolkits docstrings (#23286)

Added missed docstrings. Formatted docstrings to the consistent form.

---------

Co-authored-by: ccurme <chester.curme@gmail.com>

libs/community/langchain_community/agent_toolkits/gitlab/toolkit.py

@@ -1,4 +1,5 @@
 """GitHub Toolkit."""
+
 from typing import Dict, List
 
 from langchain_core.tools import BaseToolkit
@@ -29,6 +30,9 @@ class GitLabToolkit(BaseToolkit):
         and comments on GitLab.
 
         See https://python.langchain.com/docs/security for more information.
+
+    Parameters:
+        tools: List[BaseTool]. The tools in the toolkit. Default is an empty list.
     """
 
     tools: List[BaseTool] = []