Add meta to form

docs/documentation/form/radio.html

@@ -56,6 +56,12 @@ doc-subtab: radio
     <h2 class="subtitle">
       The mutually exclusive <strong>radio buttons</strong> in their native format
     </h2>
+    {%
+      include meta.html
+      colors=false
+      sizes=false
+      variables=false
+    %}
 
     <hr>