Merge pull request #378 from hmrc/warning-text-fix

Warning text fix

Author: kr8n3r

lib/govuk_tech_docs/warning_text_extension.rb

@@ -10,7 +10,7 @@ def warning_text(text)
         <div class="govuk-warning-text">
           <span class="govuk-warning-text__icon" aria-hidden="true">!</span>
           <strong class="govuk-warning-text__text">
-            <span class="govuk-warning-text__assistive">Warning</span>
+            <span class="govuk-visually-hidden">Warning</span>
             #{text}
           </strong>
         </div>