Item: remove documentation for non-conforming association

The association for CPU/Slot does not conform to the documented
association rules, so remove it from the readme so as to not mislead
others.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I00fd61d13c9d75609221698118225f6dab5fe56f
diff --git a/yaml/xyz/openbmc_project/Inventory/Item/README.md b/yaml/xyz/openbmc_project/Inventory/Item/README.md
index a66e675..9064309 100644
--- a/yaml/xyz/openbmc_project/Inventory/Item/README.md
+++ b/yaml/xyz/openbmc_project/Inventory/Item/README.md
@@ -17,6 +17,5 @@
 to Redfish schemas and then indicate the system topology.
 
 Document ObjectMapper association forward and reverse names as follows:
-* cpu and PCIe slots: [associated_pcie_slots, upstream_processor]
 * cpu and core: [containing, contained_by]
 * Sensor.Value and Bmc: [monitoring, monitored_by]