text: Title: UPDATE the Langchain Chat models support 
  Body: ### Type of Documentation Issue
  
  Incorrect documentation
  
  ### Documentation Page
  
  https://docs.browser-use.com/customize/langchain-models
  
  ### Issue Description
  
  Currently I have used Gemini to run this 
  `from langchain_google_genai import ChatGoogleGenerativeAI
  from browser_use import Agent
  import asyncio
  from dotenv import load_dotenv
  load_dotenv()
  
  async def main():
      agent = Agent(
          task="Go to Reddit, search for 'browser-use' in the search bar, click on the first post and return the first comment.",
          llm=ChatGoogleGenerativeAI(model="gemini-1.5-flash"),
      )
      result = await agent.run()
      print(result)
  
  asyncio.run(main())`
  and it worked fine so do update the docs
  
  ### Suggested Changes
  
  `from langchain_google_genai import ChatGoogleGenerativeAI
  from browser_use import Agent
  import asyncio
  from dotenv import load_dotenv
  load_dotenv()
  
  async def main():
      agent = Agent(
          task="Go to Reddit, search for 'browser-use' in the search bar, click on the first post and return the first comment.",
          llm=ChatGoogleGenerativeAI(model="gemini-1.5-flash"),
      )
      result = await agent.run()
      print(result)
  
  asyncio.run(main())`