updated docs to match new assistant open (#1083)

Author: baell

guides/assistant.mdx

@@ -66,7 +66,7 @@ Users can access the assistant in three ways:
     }}
     alt="Search bar and assistant button in dark mode."
   />
-- **URLs** with `?aiassistant=open` appended will open the assistant when the page loads. For example, [https://mintlify.com/docs?aiassistant=open](https://mintlify.com/docs?aiassistant=open).
+- **URLs** with `?assistant=open` appended will open the assistant when the page loads. For example, [https://mintlify.com/docs?assistant=open](https://mintlify.com/docs?assistant=open).
 
 Both methods open a chat panel on the right side of your docs. Users can ask any question and the assistant will search your documentation for an answer. If no relevant information is found, the assistant will respond that it cannot answer the question.