fixed some spelling mistakes, thanks @glaucomardano

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@9018 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

engine/src/jbullet/com/jme3/bullet/objects/PhysicsRigidBody.java

@@ -262,7 +262,7 @@ public class PhysicsRigidBody extends PhysicsCollisionObject {
 
     /**
      * Sets the node to kinematic mode. in this mode the node is not affected by physics
-     * but affects other physics objects. Iits kinetic force is calculated by the amount
+     * but affects other physics objects. Its kinetic force is calculated by the amount
      * of movement it is exposed to and its weight.
      * @param kinematic
      */