docs: Correct when to display ping and pong

subjects/pingpong/README.md

@@ -5,8 +5,8 @@
 Write a program that checks if all numbers up to a given number are odd or even.
 The numbers will be between 0 and 100.
 
-- If the number is odd then it prints the number and `ping` as in the example below.
-- If the number is even then it prints the number and `pong` in the same way.
+- If the number is odd then it prints the number and `pong` as in the example below.
+- If the number is even then it prints the number and `ping` in the same way.
 - If the number of arguments is invalid then do nothing.
 
 ### Usage