Fix Binder javadocs (#10907)

Fixes #10399

server/src/main/java/com/vaadin/data/Binder.java

@@ -2188,7 +2188,9 @@ public class Binder<BEAN> implements Serializable {
      * Adds field value change listener to all the fields in the binder.
      * <p>
      * Added listener is notified every time whenever any bound field value is
-     * changed. The same functionality can be achieved by adding a
+     * changed, i.e. the UI component value was changed, passed all the
+     * conversions and validations then propagated to the bound bean field. The same
+     * functionality can be achieved by adding a
      * {@link ValueChangeListener} to all fields in the {@link Binder}.
      * <p>
      * The listener is added to all fields regardless of whether the method is