Problem/Motivation
Some class files use the old standard of Definition of Drupal...
Proposed resolution
Standard now is Contains \Drupal...
Do just field_ui.
Here is a grep that shows the filenames that need updated:
lib/Drupal/field_ui/DisplayOverview.php: * Definition of Drupal\field_ui\DisplayOverview.
lib/Drupal/field_ui/FieldOverview.php: * Definition of Drupal\field_ui\FieldOverview.
lib/Drupal/field_ui/OverviewBase.php: * Definition of Drupal\field_ui\OverviewBase.
lib/Drupal/field_ui/Tests/FieldUiTestBase.php: * Definition of Drupal\field_ui\Tests\FieldUiTestBase.
lib/Drupal/field_ui/Tests/ManageDisplayTest.php: * Definition of Drupal\field_ui\Tests\ManageDisplayTest.
lib/Drupal/field_ui/Tests/ManageFieldsTest.php: * Definition of Drupal\field_ui\Tests\ManageFieldsTest.
Remaining tasks
Make the patch that updates just these files and just these lines to keep the patch reviewable.
User interface changes
None.
API changes
None.
Related Issues
Find the doc standards meta and link it here.
Related #2002624: Definition of to Contains \Drupal in field
#1310084: [meta] API documentation cleanup sprint