clarify importing all vs specific plugins

[mariusa]

fix: #34673

[GeoSot]

I would add the following too

// or getting  all of the named exports for further usage
import * as bootstrap from 'bootstrap';

and would transfer the named import

// or, specify which plugins you need:
import { Tooltip, Toast, Popover } from 'bootstrap';

below import Alert from 'bootstrap/js/dist/alert'; as an alternative

[mariusa]

Good points, done!