Update docs/reference/values.md

Co-authored-by: LB (Ben Johnston) <[email protected]>

docs/reference/values.md

@@ -14,7 +14,7 @@ You can read and write [HTML data attributes](https://developer.mozilla.org/en-U
 </div>
 ```
 
-The definition of the value data attribute should be specified in the same location as the controller data attribute.
+Data attributes used for values must be declared on the controlled element, the same one that has the `data-controller `attribute.
 
 <meta data-controller="callout" data-callout-text-value="static values = { url: String }">
 <meta data-controller="callout" data-callout-text-value="this.urlValue">