[DOCS] Fix pc.http.post and put parameter order and tidy ups.
[DOCS] Fix pc.http.post and put parameter order and tidy ups.

playcanvas/engine,sereepap2029/playcanvas,aidinabedi/playcanvas-engine,guycalledfrank/engine,MicroWorldwide/PlayCanvas,playcanvas/engine,aidinabedi/playcanvas-engine,MicroWorldwide/PlayCanvas,guycalledfrank/engine,sereepap2029/playcanvas,sereepap2029/playcanvas