Update exercises/dnd-character/instructions.md

Co-authored-by: Matthijs <19817960+MatthijsBlom@users.noreply.github.com>

Author: ErikSchierboom

exercises/dnd-character/instructions.md

@@ -25,6 +25,7 @@ Because constitution is 3, the constitution modifier is -4 and the hitpoints are
 ~~~~exercism/note
 Most programming languages feature (pseudo-)random generators, but few programming languages are designed to roll dice.
 One such language is [Troll][troll].
+
 [troll]: https://di.ku.dk/Ansatte/?pure=da%2Fpublications%2Ftroll-a-language-for-specifying-dicerolls(84a45ff0-068b-11df-825d-000ea68e967b)%2Fexport.html
 ~~~~