Random test failure from a patch that changes only comments.

After a conversation with Bedir in IRC I a filing an issue.

This issue

#2724297: Fix indentation of @defgroup views_argument_handlers.

appears to have random test failures.

Starting from #3 test failures appear to start

The "Component" designation of "migration system" is probably incorrect, it may well be a general site install problem, so I apologize for that
but as you can see the obvious error is in MigrateUpgrade7Test

	Migrate_drupal_ui.Migrate_drupal_ui
1	1	Migrate_drupal_ui.Drupal\migrate_drupal_ui\Tests\d7\MigrateUpgrade7Test
✓		- setUp
✗	
testMigrateUpgrade
fail: [Other] Line 139 of core/modules/migrate_drupal_ui/src/Tests/MigrateUpgradeTestBase.php:
"Congratulations, you upgraded Drupal!" found

To put things in context ... the test were failing at the end of DrupalCon: New Orleans 2016 -- when loading on the test infrastructure is never higher.