[2.2] Gallery-Edit spec added

Change Exposure values to -100 0 +100
Text update: “Editor” changed to “Edit”
Updated Slider behaviour with number above
Removed “Original” from Crop
Updated Crop interactions
Added Rotate option
Changed outline highlight to blue bar
Changed doc title to be for 2.2 Release
Small text edits / file date change
Added overflow crop menu with additional Aspect Ratios