Update README to reflect new syntax (#420)

Author: sameelarif

README.md

@@ -49,16 +49,16 @@ Here's a sample of what you can do with Stagehand:
 // Keep your existing Playwright code unchanged
 await page.goto("https://docs.stagehand.dev");
 
+// Stagehand AI: Act on the page
+await page.act("click on the 'Quickstart'");
+
 // Stagehand AI: Extract data from the page
 const { description } = await page.extract({
-  instruction: "Extract the description of the page",
+  instruction: "extract the description of the page",
   schema: z.object({
     description: z.string(),
   }),
 });
-
-// Stagehand AI: Act on the page
-await page.act({ action: "click on the 'Quickstart'" });
 ```
 
 ## Why?