Merge pull request #2728 from okkez/fix-typo

Fix a typo

index.html

@@ -993,7 +993,7 @@ <h2 id="arrays">Array Functions</h2>
         <span class="alias">Alias: <b>unique</b></span>
         <br />
         Produces a duplicate-free version of the <b>array</b>, using <i>===</i> to test
-        object equality. In particular only the first occurence of each value is kept.
+        object equality. In particular only the first occurrence of each value is kept.
         If you know in advance that the <b>array</b> is sorted,
         passing <i>true</i> for <b>isSorted</b> will run a much faster algorithm.
         If you want to compute unique items based on a transformation, pass an