address comment about substitution syntax

http://httpd.apache.org/docs/trunk/mod/mod_substitute.html#comment_7147

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1815480 13f79535-47bb-0310-9956-ffa450edef68

diff --git a/docs/manual/mod/mod_substitute.xml b/docs/manual/mod/mod_substitute.xml
index 5ff5d187e432f4b4c50a164ccc18a3d6f35cceae..31ab5fadc2def0d6fa900b033b6f888db8fcf591 100644 (file)
--- a/docs/manual/mod/mod_substitute.xml
+++ b/docs/manual/mod/mod_substitute.xml
@@ -69,6 +69,9 @@
         or regex of a subsequent one.</dd>
     </dl>
 
+    <p>The <var>substitution</var> is may contain literal text and regular
+    expression backreferences</p>
+
     <example><title>Example</title>
     <highlight language="config">
 &lt;Location "/"&gt;