Removed wrong attribute from the example for p4resolve

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@275362 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/OptionalTasks/perforce.html

@@ -922,7 +922,6 @@ P4Resolve does not use a change list number (it takes it from the files it is wo
 <pre>
 &lt;p4resolve
     view=&quot;//depot/projects/projectfoo/main/src/Blah.java...&quot;
-    change=&quot;${p4.change}&quot;
     resolvemode=&quot;automatic&quot;/&gt;
 </pre>