Update exercises/baffling-birthdays/introduction.md

Co-authored-by: András B Nagy <[email protected]>

Author: ErikSchierboom

exercises/baffling-birthdays/introduction.md

@@ -17,7 +17,7 @@ Ah. So _that's_ why Uncle Ted was so confident.
 Determined to turn the tables, you start looking up other paradoxes—next time, _you'll_ be the one making the bets.
 
 ~~~~exercism/note
-The birthday paradox is a veridical paradox: even though it feels wrong, it is actually true.
+The birthday paradox is a [veridical paradox][veridical-paradox]: even though it feels wrong, it is actually true.
 
 [veridical-paradox]: https://en.wikipedia.org/wiki/Paradox#Quine's_classification
 ~~~~