Update index.stories.mdx

addons/rose/addon/components/rose/form/helper-text/index.stories.mdx

@@ -19,7 +19,7 @@ by form fields and should not be used directly.
 <Preview>
   <Story name="HelperText">{{
     template: hbs`
-      <Rose::Form::HelperText @error={{this.error}} @link={{this.link}} @linkText={{this.linkTxt}}>
+      <Rose::Form::HelperText @error={{this.error}} @link={{this.link}} @linkText={{this.linkText}}>
         Helper text
       </Rose::Form::HelperText>
     `,