Bug 25772 update: slight tweek of groupID examples

This came out of 

https://www.w3.org/Bugs/Public/show_bug.cgi?id=25772


The "the" is not right here. "<var>devcie</var>" refers to a identifier that has been defined above (run the following sub steps for each discovered device, <var>device</var>). <var>s renders in italic style. We could rename <var>device</var> <var>availableDevice</var> or something to differentiate it more from the word "device" used in regular text.