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

The "<a>" template in the XSLT is not used, as we do not generate separate "printer" versions of the docs. It did not support those attributes on <a> tags.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1590492 13f79535-47bb-0310-9956-ffa450edef68
Improve documentation markup.
This is partial backport of r1519668 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1590494 13f79535-47bb-0310-9956-ffa450edef68
Improve documentation markup.
This is partial backport of r1519668 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1590495 13f79535-47bb-0310-9956-ffa450edef68
Improve documentation markup.
This is partial backport of r1519668 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1590496 13f79535-47bb-0310-9956-ffa450edef68
Improve documentation markup.
This is partial backport of r1519668 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1590497 13f79535-47bb-0310-9956-ffa450edef68