Fine-tune contributor_callout

Co-authored-by: Emily Gould <4822039+emilyistoofunky@users.noreply.github.com>

Author: Steve Winton

data/ui.yml

@@ -158,4 +158,4 @@ product_sublanding:
 learning_track_nav:
   prevGuide: Previous guide
   nextGuide: Next guide
-contributor_callout: This page is kindly contributed and maintained by
+contributor_callout: This article is contributed and maintained by