some minor cleanups

Bonk/AABB.cs

@@ -26,11 +26,13 @@ namespace MoonTools.Bonk
 
         public float Right { get { return Max.X; } }
         public float Left { get { return Min.X; } }
+
         /// <summary>
         /// The top of the AABB. Assumes a downward-aligned Y axis, so this value will be smaller than Bottom.
         /// </summary>
         /// <value></value>
         public float Top { get { return Min.Y; } }
+
         /// <summary>
         /// The bottom of the AABB. Assumes a downward-aligned Y axis, so this value will be larger than Top.
         /// </summary>

Bonk/Shapes/Point.cs

@@ -4,6 +4,9 @@ using MoonTools.Structs;
 
 namespace MoonTools.Bonk
 {
+    /// <summary>
+    /// A Point is "that which has not part". All points by themselves are identical.
+    /// </summary>
     public struct Point : IShape2D, IEquatable<Point>
     {
         public AABB AABB { get; }

Bonk/Shapes/Polygon.cs

@@ -59,7 +59,7 @@ namespace MoonTools.Bonk
 
         public bool Equals(IShape2D other)
         {
-            return (other is Polygon otherPolygon && Equals(otherPolygon));
+            return other is Polygon otherPolygon && Equals(otherPolygon);
         }
 
         public bool Equals(Polygon other)

Bonk/SweepTest/SweepResult.cs

@@ -5,7 +5,7 @@ namespace MoonTools.Bonk
 {
     public struct SweepResult<T> where T : IEquatable<T>
     {
-        public static SweepResult<T> False = new SweepResult<T>();
+        public readonly static SweepResult<T> False = new SweepResult<T>();
 
         public bool Hit { get; }
         public Vector2 Motion { get; }