Describe new autoPanPadding{TopLeft,BottomRight} Popup options

Options were added in #1972.
Undo (accidental) removal of 'Point'
Merge branch 'gh-pages' of https://github.com/n0nick/Leaflet into gh-pages-master

* 'gh-pages' of https://github.com/n0nick/Leaflet:
  Undo (accidental) removal of 'Point'
  Describe new autoPanPadding{TopLeft,BottomRight} Popup options