Add moar xml doc details.

src/ImageSharp/Processing/Quantization/OctreeQuantizer.cs

@@ -11,6 +11,9 @@ namespace SixLabors.ImageSharp.Processing.Quantization
     /// <summary>
     /// Allows the quantization of images pixels using Octrees.
     /// <see href="http://msdn.microsoft.com/en-us/library/aa479306.aspx"/>
+    /// <para>
+    /// By default the quantizer uses <see cref="KnownDiffusers.FloydSteinberg"/> dithering and a color palette of a maximum length of <value>255</value>
+    /// </para>
     /// </summary>
     public class OctreeQuantizer : IQuantizer
     {

src/ImageSharp/Processing/Quantization/PaletteQuantizer.cs

@@ -10,8 +10,10 @@ namespace SixLabors.ImageSharp.Processing.Quantization
 {
     /// <summary>
     /// Allows the quantization of images pixels using web safe colors defined in the CSS Color Module Level 4.
-    /// <see href="http://msdn.microsoft.com/en-us/library/aa479306.aspx"/>
+    /// <see href="http://msdn.microsoft.com/en-us/library/aa479306.aspx"/> Override this class to provide your own palette.
-    /// Override this class to provide your own palette.
+    /// <para>
+    /// By default the quantizer uses <see cref="KnownDiffusers.FloydSteinberg"/> dithering and the <see cref="NamedColors{TPixel}.WebSafePalette"/>
+    /// </para>
     /// </summary>
     public class PaletteQuantizer : IQuantizer
     {

src/ImageSharp/Processing/Quantization/WuQuantizer.cs

@@ -9,8 +9,10 @@ using SixLabors.ImageSharp.Processing.Quantization.FrameQuantizers;
 namespace SixLabors.ImageSharp.Processing.Quantization
 {
     /// <summary>
-    /// Allows the quantization of images pixels using Xiaolin Wu's Color Quantizer.
+    /// Allows the quantization of images pixels using Xiaolin Wu's Color Quantizer <see href="http://www.ece.mcmaster.ca/~xwu/cq.c"/>
-    /// <see href="http://www.ece.mcmaster.ca/~xwu/cq.c"/>
+    /// <para>
+    /// By default the quantizer uses <see cref="KnownDiffusers.FloydSteinberg"/> dithering and a color palette of a maximum length of <value>255</value>
+    /// </para>
     /// </summary>
     public class WuQuantizer : IQuantizer
     {