Update base/src/main/java/com/smartdevicelink/proxy/SystemCapabilityManager.java

Co-Authored-By: Joel Fischer <joeljfischer@gmail.com>

Author: bilal-alsharifi

base/src/main/java/com/smartdevicelink/proxy/SystemCapabilityManager.java

@@ -554,7 +554,7 @@ private void retrieveCapability(final SystemCapabilityType systemCapabilityType,
 
 		/*
 		The subscription flag in the request should be set based on multiple variables:
-		- if subscribe is null (no change), shouldSubscribe = current subscription status
+		- if subscribe is null (no change), shouldSubscribe = current subscription status, or false if the HU does not support subscriptions
 		- if subscribe is false, then shouldSubscribe = false
 		- if subscribe is true and the HU supports subscriptions, then shouldSubscribe = true
 		*/