Update static/usage/v8/checkbox/helper-error/javascript.md

Co-authored-by: Brandy Smith <brandyscarney@users.noreply.github.com>

Author: thetaPC

static/usage/v8/checkbox/helper-error/javascript.md

@@ -1,6 +1,6 @@
 ```html
 <form id="my-form">
-  <ion-checkbox helper-text="This needs to be checked" error-text="This field is required">
+  <ion-checkbox helper-text="Agree to the terms before continuing" error-text="You must agree to the terms to continue">
     I agree to the terms and conditions
   </ion-checkbox>