Fixed a broken perldoc link

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc8.0.x/trunk@1834123 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/webapps/docs/rewrite.xml b/webapps/docs/rewrite.xml
index a4f1732..bdeae86 100644
--- a/webapps/docs/rewrite.xml
+++ b/webapps/docs/rewrite.xml
@@ -456,7 +456,7 @@
 
       <p>For more information about regular expressions, have a look at the
       perl regular expression manpage ("<a
-      href="http://www.perldoc.com/perl5.6.1/pod/perlre.html">perldoc
+      href="https://perldoc.perl.org/perlre.html">perldoc
       perlre</a>"). If you are interested in more detailed
       information about regular expressions and their variants
       (POSIX regex etc.) the following book is dedicated to this topic:</p>