Correct docs of arcade physics body member

Author: Sun0fABeach

src/physics/arcade/Body.js

@@ -516,7 +516,7 @@ var Body = new Class({
         this.mass = 1;
 
         /**
-         * The calculated angle of this Body's velocity vector, in degrees, during the last step.
+         * The calculated angle of this Body's velocity vector, in radians, during the last step.
          *
          * @name Phaser.Physics.Arcade.Body#angle
          * @type {number}