Redfish.md: Add some missing system properties

When looking at SerialConsole, noticed it wasn't in Redfish.md. Added it
along with FabricAdapters and PCIeDevices which were also missing.

Tested: None. Doc change only.

Change-Id: I91b9a007647fe678020d655b92284b2ff1b4bd47
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/Redfish.md b/Redfish.md
index fce89c8..bc41ae5 100644
--- a/Redfish.md
+++ b/Redfish.md
@@ -776,6 +776,7 @@
 - Boot
 - BootProgress
 - Description
+- FabricAdapters
 - HostWatchdogTimer
 - IdlePowerSaver/Enable
 - IdlePowerSaver/EnterUtilizationPercent
@@ -792,12 +793,18 @@
 - Memory
 - MemorySummary
 - Model
+- PCIeDevices
 - PartNumber
 - PowerMode
 - PowerRestorePolicy
 - PowerState
 - ProcessorSummary
 - Processors
+- SerialConsole/IPMI/ServiceEnabled
+- SerialConsole/MaxConcurrentSessions
+- SerialConsole/SSH/HotKeySequenceDisplay
+- SerialConsole/SSH/Port
+- SerialConsole/SSH/ServiceEnabled
 - SerialNumber
 - Status
 - Storage