Allow the result vector for cross to be the same as one of the input vectors. Fix cross function docs.
Allow the result vector for cross to be the same as one of the input vectors.
Fix cross function docs.

--HG--
branch : feature/math-objects

SuperStarPL/engine,horryq/engine-1,H1Gdev/engine,sanyaade-teachings/engine,nizihabi/engine,sanyaade-teachings/engine,horryq/engine-1,aidinabedi/playcanvas-engine,playcanvas/engine,maxwellalive/engine,H1Gdev/engine,guycalledfrank/engine,RainsSoft/engine,SuperStarPL/engine,MicroWorldwide/PlayCanvas,playcanvas/engine,maxwellalive/engine,nizihabi/engine,aidinabedi/playcanvas-engine,shinate/engine,sereepap2029/playcanvas,3DGEOM/engine,guycalledfrank/engine,sanyaade-teachings/engine,horryq/engine-1,shinate/engine,3DGEOM/engine,maxwellalive/engine,RainsSoft/engine,SuperStarPL/engine,3DGEOM/engine,sereepap2029/playcanvas,MicroWorldwide/PlayCanvas,shinate/engine,sereepap2029/playcanvas,RainsSoft/engine,nizihabi/engine