update

Author: Hemav009

dsa-solutions/lc-solutions/0000-0099/0091-Decode-Ways.md

@@ -56,7 +56,7 @@ Output: 0
 Explanation: "06" cannot be mapped to "F" because of the leading zero ("6" is different from "06").
 ```
 
-Constraints:
+### Constraints:
 
 - $1 <= s.length <= 100$
 - s contains only digits and may contain leading zero(s).