docs(grid): fill in how it works, spelling fixes
docs(grid): fill in how it works, spelling fixes

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