Put function names in single quotes

I think this will appease the spell checker.

docs/examples/discussion/PID_allocation_for_example_apps.md

@@ -1,15 +1,16 @@
 # PID allocation for example apps
 
 Unless specifically overridden by the platform, example apps in this SDK use the
-Example credentials implementation in DeviceAttestationCredsExample.cpp.
+Example credentials implementation in `DeviceAttestationCredsExample.cpp`.
 
-The SDK holds example certificates for VID 0xFFF1 and PIDs 0x8000-0x801F. The
-device VID and PID supplied by the basic information cluster must correspond to
-the VID/PID given in the certificate for the device to pass verification.
+The SDK holds example certificates for VID '0xFFF1' and any PID in
+'0x8000-0x801F'. The device VID and PID supplied by the basic information
+cluster must correspond to the VID/PID given in the certificate for the device
+to pass verification.
 
 Certificates are selected using the value in
 CHIP_DEVICE_CONFIG_DEVICE_PRODUCT_ID. The vendor ID for every example app is the
-same because they are all signed by the same PAI (vendor id 0xFFF1).
+same because they are all signed by the same PAI (vendor id '0xFFF1').
 
 In order to allow some differentiation between the various example apps, each
 app is assigned a PID from the list below: