doc only: Fix broken link

It looks like the paths changed in phosphor-dbus-interfaces

Signed-off-by: John Edward Broadbent <jebr@google.com>
Change-Id: I07b6228e9b978669b3856a4f5e8a783d120f503e
diff --git a/docs/EntityManagerDbusAPI.md b/docs/EntityManagerDbusAPI.md
index 8b0660f..0c034d8 100644
--- a/docs/EntityManagerDbusAPI.md
+++ b/docs/EntityManagerDbusAPI.md
@@ -32,7 +32,7 @@
 
 #### xyz.openbmc_project.{InventoryType}
 
-See [upstream types](https://github.com/openbmc/phosphor-dbus-interfaces/tree/master/xyz/openbmc_project/Inventory/Item)
+See [upstream types](https://github.com/openbmc/phosphor-dbus-interfaces/tree/master/yaml/xyz/openbmc_project/Inventory/Item)
 
 * BMC
 * Board