Correct a typo. Mention attribute name.
Merged revision 1643539 from tomcat/tc8.0.x/trunk.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1643540 13f79535-47bb-0310-9956-ffa450edef68
Followup to r1643334: Replace calls to System.getProperty("path.separator") with File.pathSeparator
One place missed in r1643334. This is in deprecated code that we never call.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1643545 13f79535-47bb-0310-9956-ffa450edef68