Issue #3256056 by andregp: Entity query system does not document the NOT...

Issue #3256056 by andregp: Entity query system does not document the NOT BETWEEN operator, but JSON:API supports/uses it

core/lib/Drupal/Core/Entity/Query/QueryAggregateInterface.php

@@ -55,8 +55,8 @@ public function groupBy($field);
    *     same type as the column.
    *   - 'IN', 'NOT IN': These operators expect $value to be an array of
    *     literals of the same type as the column.
-   *   - 'BETWEEN': This operator expects $value to be an array of two literals
-   *     of the same type as the column.
+   *   - 'BETWEEN', 'NOT BETWEEN': These operators expect $value to be an array
+   *     of two literals of the same type as the column.
    * @param string $langcode
    *   (optional) The language code.
    *