Tightened the source code and README documentations in the library.

Sources/PlaydateKit/Graphics/Enumerations/DrawMode.swift

@@ -1,23 +1,19 @@
 internal import CPlaydate
 
 extension Graphics {
-    /// How source pixels combine with the destination when drawing.
+    /// Wraps `LCDBitmapDrawMode`: how bitmap and text pixels combine with the destination.
     public enum DrawMode: UInt32, Sendable {
-        /// Source pixels replace the destination.
         case copy = 0
-        /// White source pixels are treated as transparent.
+        /// White source pixels are transparent.
         case whiteTransparent = 1
-        /// Black source pixels are treated as transparent.
+        /// Black source pixels are transparent.
         case blackTransparent = 2
         /// Opaque source pixels draw white.
         case fillWhite = 3
         /// Opaque source pixels draw black.
         case fillBlack = 4
-        /// Source pixels are XORed with the destination.
         case xor = 5
-        /// The inverse of `xor`.
         case nxor = 6
-        /// Source pixels draw inverted.
         case inverted = 7
 
         init(_ mode: LCDBitmapDrawMode) { self = DrawMode(rawValue: UInt32(mode.rawValue)) ?? .copy }