Update the sdk doc of Default & ShortEdge cutout mode

We now allow OEMs to extend the window to cutout area in below cutout
mode, only if the cutout overlaps at most 16dp with the app windows.
 - LAYOUT_IN_DISPLAY_CUTOUT_MODE_DEFUALT
 - LAYOUT_IN_DISPLAY_CUTOUT_MODE_SHORT_EDGES

Bug: 218603390
Test: make
Change-Id: I8c83cde40f321de2a301b5865445ff765c824d43
Merged-In: I8c83cde40f321de2a301b5865445ff765c824d43