docs(components): update tabs-striped css class
docs(components): update tabs-striped css class

Closes [#2697](https://github.com/driftyco/ionic/issues/2697)
martinjbaker/ionic-site,sachinvettithanam/ionic-site,thiagofelix/ionic-site,johnli388/ionic-site,saimandeper/ionic-site,ionic-team/ionic-site,ionic-team/ionic-site,martinjbaker/ionic-site,thiagofelix/ionic-site,philmerrell/ionic-site,saimandeper/ionic-site,stianjensen/ionic-site,matheusrocha89/ionic-site,philmerrell/ionic-site,stianjensen/ionic-site,ionic-team/ionic-site,philmerrell/ionic-site,qintengfei/ionic-site,driftyco/ionic-site,sachinvettithanam/ionic-site,johnli388/ionic-site,ionic-team/ionic-site,driftyco/ionic-site,driftyco/ionic-site,sachinvettithanam/ionic-site,qintengfei/ionic-site,saimandeper/ionic-site,qintengfei/ionic-site,driftyco/ionic-site,driftyco/ionic-site,matheusrocha89/ionic-site,martinjbaker/ionic-site,stianjensen/ionic-site,thiagofelix/ionic-site,johnli388/ionic-site