tweak svnpubsub checkoutDirectory to match complete Maven site structure

git-svn-id: https://svn.apache.org/repos/asf/maven/doxia/doxia/trunk@1470804 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index 2c2e2f8..61f2e80 100644
--- a/pom.xml
+++ b/pom.xml
@@ -341,7 +341,7 @@
           <artifactId>maven-scm-publish-plugin</artifactId>
           <configuration>
             <content>${project.build.directory}/staging/${maven.site.path}</content>
-            <checkoutDirectory>${maven.site.cache}/${maven.site.path}</checkoutDirectory>
+            <checkoutDirectory>${maven.site.cache}/doxia/${maven.site.path}</checkoutDirectory>
             <tryUpdate>true</tryUpdate>
           </configuration>
         </plugin>