docs(checkbox): rename Angular 2 to Angular (#11831)
docs(checkbox): rename Angular 2 to Angular (#11831)

* docs(api-checkbox): renamed Angular 2 to Angular

* Update checkbox.ts

alan-agius4/ionic,alan-agius4/ionic,alan-agius4/ionic,TillaTheHun0/ionic,alan-agius4/ionic,driftyco/ionic,TillaTheHun0/ionic,driftyco/ionic,driftyco/ionic,TillaTheHun0/ionic,alan-agius4/ionic,driftyco/ionic,alan-agius4/ionic,driftyco/ionic,TillaTheHun0/ionic