Merge "docs: Added note - test subscriptions cannot use reserved IDs" into nyc-dev am: dbe9b81ef5 am: 2ff9c02bdc am: b7c9651555 am: d99f3b7214 am: 75896821cb
am: 8cebd14d27

Change-Id: Ic713435cf6001770960af48a51efc5d975edff9c