added helpful text. (#31603)

src/applications/check-in/locales/en/translation.json

@@ -428,7 +428,7 @@
   "bring-insurance-cards-list-medications-other": "Bring your insurance cards, a list of medications, and other things to share with your provider.",
   "find-out-what-to-bring": "Find out what to bring to your appointment",
   "how-to-check-in": "How to check in",
-  "find-out-how-to-check-in": "Find out how to check in",
+  "find-out-how-to-check-in": "Find out how to check in (opens in new tab)",
   "manage-your-appointments": "Manage your appointments",
   "sign-in-to-vagov-and-schedule": "Sign in to VA.gov and schedule",
   "review-your-upcoming-appointments": "Review your upcoming appointments",