Documentation tweaks for CORS filter.
Patch provided by Mohit Soni.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1489738 13f79535-47bb-0310-9956-ffa450edef68
Add removeSuspectsTimeout attribute in order to dispel remove suspect.
The removeSuspects members never be removed until disappeared really.
Remove members that worked properly specified time by removeSuspectsTimeout from removeSuspects.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1489752 13f79535-47bb-0310-9956-ffa450edef68