CTR: documentation
Fix processing of "target", "rel" attributes on links in Documentation.

The "<a>" template in the XSLT is not useful, as nowadays we do not generate separate "printer" versions of the docs. It did not support those attributes on <a> tags.
It is backport of r1590492 from tc7.0.x.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc6.0.x/trunk@1590493 13f79535-47bb-0310-9956-ffa450edef68