Reference select guide instead of documenting selected attribute (#3224)

Co-authored-by: 宋文强 <pwnn@users.noreply.github.com>

content/docs/reference-dom-elements.md

@@ -56,7 +56,8 @@ The `onChange` event behaves as you would expect it to: whenever a form field is
 
 ### selected {#selected}
 
-The `selected` attribute is supported by `<option>` components. You can use it to set whether the component is selected. This is useful for building controlled components.
+If you want to mark an `<option>` as selected, reference the value of that option in the `value` of its `<select>` instead.
+Check out ["The select Tag"](/docs/forms.html#the-select-tag) for detailed instructions.
 
 ### style {#style}