fixed some typos
fixed some typos

Found some typos to do with physics settings that are causing the exporter to fail when trying to export scene that uses physics settings
Kesshi/Babylon.js,sebavan/Babylon.js,abow/Babylon.js,Hersir88/Babylon.js,Hersir88/Babylon.js,abow/Babylon.js,jbousquie/Babylon.js,BabylonJS/Babylon.js,RaananW/Babylon.js,NicolasBuecher/Babylon.js,Kesshi/Babylon.js,sebavan/Babylon.js,Temechon/Babylon.js,Temechon/Babylon.js,BabylonJS/Babylon.js,RaananW/Babylon.js,RaananW/Babylon.js,BabylonJS/Babylon.js,sebavan/Babylon.js,NicolasBuecher/Babylon.js,Hersir88/Babylon.js,abow/Babylon.js,NicolasBuecher/Babylon.js,Kesshi/Babylon.js,jbousquie/Babylon.js,Temechon/Babylon.js,jbousquie/Babylon.js