docs(grid): update grid docs to remove reference to directive
docs(grid): update grid docs to remove reference to directive

driftyco/ionic,TillaTheHun0/ionic,TillaTheHun0/ionic,driftyco/ionic,driftyco/ionic,driftyco/ionic,TillaTheHun0/ionic,driftyco/ionic,TillaTheHun0/ionic