changed install link from 2.4.2 to 2.5

git-svn-id: https://svn.apache.org/repos/asf/vcl/site/trunk@1820602 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/content/docs/installation.mdtext b/content/docs/installation.mdtext
index 1e9ca95..443b98a 100644
--- a/content/docs/installation.mdtext
+++ b/content/docs/installation.mdtext
@@ -20,7 +20,7 @@
 explaining configuration items that an installer would typically do.
 
 
-[VCL 2.4.2 Installation Guide - Current Release](/docs/VCL242InstallGuide.html)
+[VCL 2.5 Installation Guide - Current Release](/docs/VCL25InstallGuide.html)
 
 
 Supplemental configuration guides