typo fix

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@269967 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/CoreTasks/exec.html

@@ -80,7 +80,7 @@ systems.</p>
         where available. If set to false the underlying OS's shell,
         either directly or through the antRun scripts, will be used.
         Under some operating systems, this gives access to facilities
-        not nomrally available through the VM including, under Windows,
+        not normally available through the VM including, under Windows,
         being able to execute scripts, rather than their associated
         interpreter.</td>
     <td align="center" valign="top">No, default is <i>true</i></td>