Bugzilla 42661: usefull -> useful

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@547250 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/CoreTasks/sql.html

@@ -167,7 +167,7 @@ and <b>abort</b> execution and transaction and fail task.</p>
 <tr>
   <td width="12%" valign="top">keepformat</td>
   <td width="78%" valign="top">Control whether the format of the sql will be preserved.<br>
-    Usefull when loading packages and procedures.
+    Useful when loading packages and procedures.
   <td width="10%" valign="top">No (default=false)</td>
 </tr>