Issue #3526251 by prudloff: Incorrect type for #access in RenderElementBase documentation

 *

 * Here is the list of the properties used during the rendering of all render

 * elements:

 * - #access: (bool) Whether the element is accessible or not. When FALSE,

 * - #access: (bool or AccessResultInterface)

 *   Whether the element is accessible or not.

 *   When the value is FALSE (if boolean)

 *   or the isAllowed() method returns FALSE (if AccessResultInterface),

 *   the element is not rendered and user-submitted values are not taken

 *   into consideration.

 * - #access_callback: A callable or function name to call to check access.