Fixing javadoc groups.

Change-Id: If3dc0f78e7470c9f0a6881b6f22beda00e1d3180
diff --git a/docs/internal-apps b/docs/internal-apps
index 0bba4fe..8c4a493 100644
--- a/docs/internal-apps
+++ b/docs/internal-apps
@@ -4,6 +4,7 @@
 org.onosproject.acl*
 org.onosproject.aaa
 org.onosproject.fwd
+org.onosproject.dhcp*
 org.onosproject.flowanalyzer
 org.onosproject.mobility
 org.onosproject.proxyarp