Added a note in line 16 (freeCodeCamp#1403)

Explained that the position in an array starts at 0 as opposed to 1.
0x51 · Oct 27, 2017 · 011b58f · 011b58f
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diff --git a/src/pages/certificates/access-array-data-with-indexes/index.md b/src/pages/certificates/access-array-data-with-indexes/index.md
@@ -12,3 +12,5 @@ var array = [1, 2, 3];
 array[0]; // equals 1
 var data = array[1]; // sets the data variable to 2
 ```
+
+Note: The index for arrays start from 0 as opposed to 1. Hence, array[0] equals 1. You can also think of it as position. In the above example 1 resides in position 0, 2 in position 1 and 3 in position 2.