fix: make markdown linter happy

Author: vaeng

exercises/relative-distance/introduction.md

@@ -2,7 +2,7 @@
 
 You've been hired to develop **Noble Knots**, the hottest new dating app for nobility!
 With centuries of royal intermarriage, things have gotten… _complicated_.
-To avoid any *oops-we're-twins* situations, your job is to build a system that checks how closely two people are related.  
+To avoid any _oops-we're-twins_ situations, your job is to build a system that checks how closely two people are related.  
 
 Inspired by Iceland’s famous "[Islendinga-App][islendiga-app]" (which prevents accidental dating of a close relative), your algorithm will determine the **degree of separation** between two individuals in the royal family tree.