Issue #3105925 by kiamlaluno: The description of the arguments for...

Issue #3105925 by kiamlaluno: The description of the arguments for FieldDefinition::setDisplayOptions() conflicts with what reported in FieldDefinitionInterface::getDisplayOptions()

(cherry picked from commit d7f58c36)

core/lib/Drupal/Core/Field/FieldDefinition.php

@@ -143,7 +143,7 @@ public function isDisplayConfigurable($display_context) {
    *   An array of display options. Refer to
    *   \Drupal\Core\Field\FieldDefinitionInterface::getDisplayOptions() for
    *   a list of supported keys. The options should include at least a 'weight',
-   *   or specify 'type' = 'hidden'. The 'default_widget' / 'default_formatter'
+   *   or specify 'region' = 'hidden'. The 'default_widget'/'default_formatter'
    *   for the field type will be used if no 'type' is specified.
    *
    * @return $this