Fix a little typo around the codebase (introduced by XB → Canvas rename)
>>> [!note] Migrated issue
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<!-- Migrated from issue #3556052. -->
Reported by: [traviscarden](https://www.drupal.org/user/236758)
Related to !294
>>>
<p>There's a curious little typo that appears here and here in the codebase: "an Drupal" instead of "a Drupal". Kind of funny. But trivial problem, trivial fix. 🙂</p>
issue