Fixed typo (#3742)

docs/data/index.html

@@ -54,7 +54,7 @@
   <h2>DataSet</h2>
 
   <p>
-    A <code>DataSet</code> can be used to store JSON objects by id. Objects can be added, updated and removed from the DatSet, and one can subscribe to changes in the <code>DataSet</code>.
+    A <code>DataSet</code> can be used to store JSON objects by id. Objects can be added, updated and removed from the DataSet, and one can subscribe to changes in the <code>DataSet</code>.
     The data in the <code>DataSet</code> can be filtered and ordered, and fields (like
     dates) can be converted to a specific type. Data can be normalized when
     appending it to the <code>DataSet</code> as well.