Close parentheses on docs page.
Noted on comments.a.o.

Backport of r1439054 from trunk resp.
r1439055 ffrom tc7.


git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc6.0.x/trunk@1439058 13f79535-47bb-0310-9956-ffa450edef68