Update 0509 - Fibonacci Numbers

Author: katarianikita2003

dsa-solutions/lc-solutions/0500-0599/0509-Fibonacci-Numbers.md

@@ -21,7 +21,7 @@ The Fibonacci numbers, commonly denoted F(n), form a sequence, called the Fibona
 
 - F(0) = 0
 - F(1) = 1
-- F(n) = F(n-1) + F(n-2) for n > 1
+- F(n) = F(n-1) + F(n-2) for n > 1
 
 Given an integer n, calculate F(n).