docs: switch 'Action' component to 'Getters' to match other Vuex examples

[chrisdiana]

Resubmitting on the correct branch this time.

Other Vuex examples are using the the type of store method as the name of the component:

Actions:

import Actions from '../../../src/components/Actions'

Modules:

import Modules from '../../../src/components/Modules'

Set Getters example component to match these to minimize confusion. Looks like Portuguese was already fixed.

[eddyerburgh]

Thanks :)