TypeError: Drupal\Core\Field\FieldTypeCategory::getDescription() Return value must be of type Drupal\Core\StringTranslation\TranslatableMarkup [#3413213]

Problem/Motivation

Going to add a field to a content type with a DOI field produces the following error:

TypeError: Drupal\Core\Field\FieldTypeCategory::getDescription(): Return value must be of type Drupal\Core\StringTranslation\TranslatableMarkup, string returned in Drupal\Core\Field\FieldTypeCategory->getDescription()

This appears to be because there is no description in the annotation of DoiFieldItem.

See https://www.drupal.org/project/drupal/issues/3409413

Issue fork doi_field-3413213

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