Pull request [jasnell/w3c-socialwg-activitystreams] Update activitystreams2.html

Update activitystreams2.html
By evanp 
Corrected the spelling of "publisher" and added an article and an apostrophe.
June 30, 2015 at 08:35AM
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Received on Tuesday, 30 June 2015 15:49:42 UTC