Update grid.html
Update grid.html

Add mention of the `wrap` property for ion-rows
driftyco/ionic-site,ionic-team/ionic-site,driftyco/ionic-site,driftyco/ionic-site,driftyco/ionic-site,ionic-team/ionic-site,ionic-team/ionic-site,driftyco/ionic-site,ionic-team/ionic-site