Fix formatting of variable declarations in correlation method

Author: kvadrik

src/main/java/com/thealgorithms/maths/Correlation.java

@@ -21,8 +21,8 @@ private Correlation() {
      * @return The result of the correlation of variables x,y.
      */
     public static double correlation(double[] x, double[] y, int n) {
-        double exy = 0; 
-		double ex = 0; 
+        double exy = 0;
+		double ex = 0;
 		double exx = 0;
 		double ey = 0;
 		double eyy = 0;