fix(book/operators): modulo example (#180)

Author: Polaristow

pages/book/operators.mdx

@@ -127,7 +127,7 @@ Can only be applied to values of type [`Int{:tact}`][int]:
 ```tact
 let two: Int = 2;
 two % 2; // 0
-two % 1; // 1
+1 % two; // 1
 
 1 % 5;   // 1
 -1 % 5;  // 4