description for setProps - to reduce warnings

Author: alexcjohnson

scripts/generate-components.js

@@ -192,6 +192,9 @@ function generatePropTypes(element, attributes) {
         component_name: PropTypes.string,
     }),
 
+    /**
+     * Dash-assigned callback that gets fired when the element is clicked.
+     */
     'setProps': PropTypes.func`
 }