Point people to phosphor-dbus-interfaces repo for doc

For all v1.99.xx and greater code, the interfaces are
now defined in the phosphor-dbus-interfaces repo

Change-Id: I042740515270e77aca09ce6d4616beaf09c4c4b1
Signed-off-by: Andrew Geissler <andrewg@us.ibm.com>
diff --git a/dbus-interfaces.md b/dbus-interfaces.md
index c207a0a..315781f 100644
--- a/dbus-interfaces.md
+++ b/dbus-interfaces.md
@@ -1,5 +1,10 @@
 OpenBMC DBUS API
 ================
+
+Please **note** that the v1.99.xx and greater code now has all of it's
+interfaces defined in [this](https://github.com/openbmc/phosphor-dbus-interfaces)
+repository.  The below information in this document is for all v1.0.xx code.
+
 This document aims to specify the OpenBMC DBUS API.
 
 The Phosphor distribution provides sample applications that implement off all