Fix comment about the coordinate system of the position.
Fix comment about the coordinate system of the position.

TEST=none
BUG=none
Iwan12/ppapi,jmnjmn/ppapi,jmnjmn/ppapi,thecocce/ppapi,Iwan12/ppapi,LinRaise/ppapi,humanai/ppapi,johnnnylm/ppapi,LinRaise/ppapi,Gitzk/ppapi,LinRaise/ppapi,thecocce/ppapi,lio972/ppapi,humanai/ppapi,johnnnylm/ppapi,humanai/ppapi,kaijajan/ppapi,kaijajan/ppapi,iofcas/ppapi,Gitzk/ppapi,thecocce/ppapi,iofcas/ppapi,jmnjmn/ppapi,Gitzk/ppapi,macressler/ppapi,jmnjmn/ppapi,kaijajan/ppapi,lio972/ppapi,humanai/ppapi,macressler/ppapi,iofcas/ppapi,johnnnylm/ppapi,jmnjmn/ppapi,humanai/ppapi,melchi45/ppapi,johnnnylm/ppapi,macressler/ppapi,melchi45/ppapi,lio972/ppapi,johnnnylm/ppapi,kaijajan/ppapi,LinRaise/ppapi,melchi45/ppapi,melchi45/ppapi,macressler/ppapi,iofcas/ppapi,Iwan12/ppapi,Gitzk/ppapi,kaijajan/ppapi,LinRaise/ppapi,thecocce/ppapi,iofcas/ppapi,Iwan12/ppapi,macressler/ppapi,Gitzk/ppapi,Iwan12/ppapi,thecocce/ppapi,melchi45/ppapi,lio972/ppapi,lio972/ppapi