8291509: Minor cleanup could be done in sun.security

Reviewed-by: weijun

src/java.base/share/classes/sun/security/util/math/IntegerModuloP.java

@@ -158,7 +158,7 @@ public interface IntegerModuloP {
     default ImmutableIntegerModuloP multiplicativeInverse() {
         // This method is used in 2 cases:
         // 1. To calculate the inverse of a number in ECDSAOperations,
-        //    this number must be non zero (modulo p).
+        //    this number must be non-zero (modulo p).
         // 2. To flatten a 3D point to a 2D AffinePoint. This number
         //    might be zero (infinity). However, since the infinity
         //    is represented as (0, 0) in 2D, it's OK returning 0 as