docs: update xai docs (#31382)

docs/docs/integrations/providers/xai.ipynb

@@ -45,7 +45,9 @@
    "id": "8304b4d9",
    "metadata": {},
    "source": [
-    "## Example"
+    "## Example\n",
+    "\n",
+    "See [ChatXAI docs](/docs/integrations/chat/xai) for detail and supported features."
    ]
   },
   {

libs/partners/xai/langchain_xai/chat_models.py

@@ -218,6 +218,7 @@ class ChatXAI(BaseChatOpenAI):  # type: ignore[override]
         feature that enables Grok to ground its answers using results from web searches.
 
         .. code-block:: python
+
             from langchain_xai import ChatXAI
 
             llm = ChatXAI(