Home page: change wording slightly.
Home page: change wording slightly.

Change-Id: I9cedf5004273cea0a5439f4a4a0a8abf250818aa

manolama/opentsdb.net,geoffreyanderson/opentsdb.net,OpenTSDB/opentsdb.net,geoffreyanderson/opentsdb.net,geoffreyanderson/opentsdb.net,OpenTSDB/opentsdb.net,manolama/opentsdb.net,manolama/opentsdb.net,OpenTSDB/opentsdb.net