MDL-79151 customfield: Remove illegal whitespace

customfield/upgrade.txt

@@ -6,7 +6,7 @@ Information provided here is intended especially for developers.
   These files are now properly backed up when a course is backed up, and restored when the course is restored.
   Other types of custom fields can also benefit from this new API. See MDL-79151 for more information.
   `\core_customfield\handler::restore_instance_data_from_backup()` now conditionally returns a data_controller id and
-  there are two new methods, `\core_customfield\data_controller::backup_define_structure()` and 
+  there are two new methods, `\core_customfield\data_controller::backup_define_structure()` and
   `\core_customfield\data_controller::restore_define_structure()`.
 
 === 4.3 ===
@@ -21,4 +21,3 @@ Information provided here is intended especially for developers.
 * Methods \core_customfield\handler::get_field_config_form() and \core_customfield\handler::setup_edit_page() are no
   longer used. Components that define custom fields areas do not need to implement them. Field edit form opens in
   the modal now.
-