Update Assert.java

Tiny typo in the Error message that shows up when arrays are not equal (but have same length)
diff --git a/src/main/java/org/testng/Assert.java b/src/main/java/org/testng/Assert.java
index 06737bd..c945696 100644
--- a/src/main/java/org/testng/Assert.java
+++ b/src/main/java/org/testng/Assert.java
@@ -142,7 +142,7 @@
                assertEquals(_actual, _expected);
             } catch (AssertionError ae) {
                failNotEquals(actual, expected, message == null ? "" : message
-                        + " (values as index " + i + " are not the same)");
+                        + " (values at index " + i + " are not the same)");
             }
          }
          //array values matched