Fix some typos in the character demo too

Demos/Demos/Characters/CharacterControllers.cs

@@ -85,7 +85,7 @@ public struct CharacterController
     public unsafe class CharacterControllers : IDisposable
     {
         /// <summary>
-        /// Gets the simulation to which this set of chracters belongs.
+        /// Gets the simulation to which this set of characters belongs.
         /// </summary>
         public Simulation Simulation { get; private set; }
         BufferPool pool;
@@ -99,7 +99,7 @@ public unsafe class CharacterControllers : IDisposable
         public int CharacterCount { get { return characters.Count; } }
 
         /// <summary>
-        /// Creates a character controller systme.
+        /// Creates a character controller system.
         /// </summary>
         /// <param name="pool">Pool to allocate resources from.</param>
         /// <param name="initialCharacterCapacity">Number of characters to initially allocate space for.</param>

Demos/Demos/Characters/CharacterDemo.cs

@@ -135,10 +135,10 @@ public override void Initialize(ContentArchive content, Camera camera)
                 pose.Orientation = Quaternion.Identity;
                 return pose;
             };
-            var platormShapeIndex = Simulation.Shapes.Add(new Box(5, 1, 5));
+            var platformShapeIndex = Simulation.Shapes.Add(new Box(5, 1, 5));
             for (int i = 0; i < movingPlatforms.Length; ++i)
             {
-                movingPlatforms[i] = new MovingPlatform(platormShapeIndex, i * 3559, 1f / 60f, Simulation, poseCreator);
+                movingPlatforms[i] = new MovingPlatform(platformShapeIndex, i * 3559, 1f / 60f, Simulation, poseCreator);
             }
             var box = new Box(4, 1, 4);
             var boxShapeIndex = Simulation.Shapes.Add(box);