Document SuperFX sprite index for spitting upwards

[brunovalads]

The indexes in the table at $0AAB14 point at SuperFX graphics, and is indexed by sprite id * 2, and clearly there's some leftovers from early develpment, as some indexes are never reached and point to graphics we usually not see rotate or see at all. https://github.com/brunovalads/yoshisisland-disassembly/blob/8fa1ada54aa99d8d89a32575c7c9ff7cd06ed957/disassembly/bank0A.asm#L4221-L4230

This table is only read at $039CD4 and $03B658, during the handle of sprite spitting.