Update next steps for stagehand template

Updated the next steps invocation example for Stagehand so that it's accurate now.

Author: dprevoznik

index.ts

@@ -103,7 +103,7 @@ const INVOKE_SAMPLES: Record<
     [TEMPLATE_SAMPLE_APP]:
       'kernel invoke ts-basic get-page-title --payload \'{"url": "https://www.google.com"}\'',
     [TEMPLATE_STAGEHAND]:
-      'kernel invoke ts-stagehand stagehand-task --payload \'{"query": "Best wired earbuds"}\'',
+      'kernel invoke ts-stagehand headcount-task --payload \'{"query": "Kernel"}\'',
     [TEMPLATE_ADVANCED_SAMPLE]: "kernel invoke ts-advanced test-captcha-solver",
     [TEMPLATE_COMPUTER_USE]:
       'kernel invoke ts-cu cu-task --payload \'{"query": "Return the first url of a search result for NYC restaurant reviews Pete Wells"}\'',