Item Associations: Fix capitalization and clarify

This capitalization was mixed, move to the exact capitalization of the
interfaces. E.g. Cpu from [1].

Made clear it was Led.Group and Connector.Port being associated.

[1] https://github.com/openbmc/phosphor-dbus-interfaces/blob/2117deabad40f9ac63815f3338e7ac3e1e3fe397/yaml/xyz/openbmc_project/Inventory/Item/Cpu.interface.yaml

Change-Id: I2a4bc4142b5c93335259c98538e0e1754c920bff
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/yaml/xyz/openbmc_project/Inventory/Item/README.md b/yaml/xyz/openbmc_project/Inventory/Item/README.md
index aacf70c..dda2ad2 100644
--- a/yaml/xyz/openbmc_project/Inventory/Item/README.md
+++ b/yaml/xyz/openbmc_project/Inventory/Item/README.md
@@ -20,9 +20,9 @@
 
 - Item and Item: `{containing, contained_by}`
 - Sensor.Value and Bmc: `{monitoring, monitored_by}`
-- fan and item: `{cooling, cooled_by}`
-- led and item: `{identifying, identified_by}`
+- Fan and Item: `{cooling, cooled_by}`
+- Led.Group and Item: `{identifying, identified_by}`
   `{fault_identifying, fault_identified_by}`
-- powerSupply and item: `{powering, powered_by}`
-- FabricAdapter and port: `{connecting, connected_to}`
+- PowerSupply and Item: `{powering, powered_by}`
+- FabricAdapter and Connector.Port: `{connecting, connected_to}`
 - Cpu and PCIeSlot: `{connecting, connected_to}`