fix ref for python (#1210)

# why

the python ref is wrong, using object input instead of kwargs

# what changed

fix the python ref to use kwargs

# test plan

its docs

---------

Co-authored-by: Miguel <36487034+miguelg719@users.noreply.github.com>

Author: derekmeegan

packages/docs/v2/basics/agent.mdx

@@ -46,14 +46,13 @@ await agent.execute("apply for a job at Browserbase")
 ```
 
 ```python Python
-agent = stagehand.agent({
-    "provider": "anthropic",
-    "model": "claude-sonnet-4-20250514",
-    "instructions": "You are a helpful assistant that can use a web browser.",
-    "options": {
-      "apiKey": os.getenv("ANTHROPIC_API_KEY"),
+agent = stagehand.agent(
+    model="claude-sonnet-4-20250514",
+    instructions="You are a helpful assistant that can use a web browser.",
+    options={
+        "api_key": os.getenv("ANTHROPIC_API_KEY"),
     },
-})
+)
 await agent.execute("apply for a job at Browserbase")
 ```
 </CodeGroup>

packages/docs/v2/references/agent.mdx

@@ -44,11 +44,11 @@ interface AgentInstance {
 
 ```python
 # Create agent instance
-agent = stagehand.agent({
-    "model": str,
-    "instructions": str = None,
-    "options": Dict[str, Any] = None
-})
+agent = stagehand.agent(
+    model: str,
+    instructions: str = None,
+    options: Dict[str, Any] = None
+)
 ```
 
 </Tab>