- doc index

git-svn-id: http://root.cern.ch/svn/root/trunk@21449 27541ba8-7e3a-0410-8455-c3a389f83636

postscript/doc/index.txt

+BEGIN_HTML
+<ul>
+<li><a href="http://root.cern.ch/root/HowtoPS.html">How to use the PostScript interface.</a></li>
+<li><a href="http://root.cern.ch/root/htmldoc/examples/psview.C.html">An example how to display PS, EPS, PDF files in canvas.</a></li>
+</ul>
+END_HTML