map.rotate doc string improvements.
map.rotate doc string improvements.

Use See Also to link affine_transform and make it clear that scipy and
skimage are not the same thing and point out that higher order
interpolation is more accurate but slower.

Alex-Ian-Hamilton/sunpy,dpshelio/sunpy,Alex-Ian-Hamilton/sunpy,dpshelio/sunpy,Alex-Ian-Hamilton/sunpy,dpshelio/sunpy