Add ap-if docs.
Add ap-if docs.

paultag/hy,timmartin/hy,tianon/hy,gilch/hy,aisk/hy,tuturto/hy,michel-slm/hy,adamfeuer/hy,Tritlo/hy,aisk/hy,farhaven/hy,tianon/hy,farhaven/hy,kirbyfan64/hy,kartikm/hy,tianon/hy,larme/hy,mtmiller/hy,algernon/hy,freezas/hy,farhaven/hy,ALSchwalm/hy,kirbyfan64/hy,larme/hy,Foxboron/hy,Foxboron/hy,aisk/hy,jakirkham/hy,zackmdavis/hy,larme/hy