docs(slides): update slides docs (#9968)
docs(slides): update slides docs (#9968)

Change the `pager` description.
Change the `paginationType` input type.
alan-agius4/ionic,joshesp/ionic,alan-agius4/ionic,joshesp/ionic,joshesp/ionic,driftyco/ionic,TillaTheHun0/ionic,TillaTheHun0/ionic,alan-agius4/ionic,alan-agius4/ionic,driftyco/ionic,TillaTheHun0/ionic,alan-agius4/ionic,driftyco/ionic,driftyco/ionic,joshesp/ionic,TillaTheHun0/ionic,driftyco/ionic,alan-agius4/ionic