Fix Matrix.toString()

Author: th-we

kernel/src/main/java/com/itextpdf/kernel/geom/Matrix.java

@@ -293,7 +293,7 @@ public int hashCode() {
     @Override
     public String toString() {
         return  vals[I11] + "\t" + vals[I12] + "\t" + vals[I13] + "\n" +
-                vals[I21] + "\t" + vals[I22] + "\t" + vals[I13] + "\n" +
+                vals[I21] + "\t" + vals[I22] + "\t" + vals[I23] + "\n" +
                 vals[I31] + "\t" + vals[I32] + "\t" + vals[I33];
     }
 }