Inventory: Restrict to a single manager

The Manager interface implies multiple managers are allowed but
they are not.  It is not possible to implement the same interface
on the same path twice.

Change-Id: I50cc155c8e1d550128e4c67a96501cc15b9d05d9
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/xyz/openbmc_project/Inventory/Manager.interface.yaml b/xyz/openbmc_project/Inventory/Manager.interface.yaml
index 94019e8..6b894e1 100644
--- a/xyz/openbmc_project/Inventory/Manager.interface.yaml
+++ b/xyz/openbmc_project/Inventory/Manager.interface.yaml
@@ -2,7 +2,7 @@
     Implement to provide inventory management features.
 
     An OpenBMC implementation providing inventory functions may provide zero
-    or more implementations on the inventory namespace root.  An implementing
+    or one implementation on the inventory namespace root.  An implementing
     service should additionally implement org.freedesktop.DBus.ObjectManager
     on the inventory namespace root.
 methods: