Improve comments

src/Avalonia.Controls.ColorPicker/Converters/AccentColorConverter.cs

@@ -7,8 +7,10 @@ namespace Avalonia.Controls.Primitives.Converters
 {
     /// <summary>
     /// Creates an accent color for a given base color value and step parameter.
-    /// This is a highly-specialized converter for the color picker.
     /// </summary>
+    /// <remarks>
+    /// This is a highly-specialized converter for the color picker.
+    /// </remarks>
     public class AccentColorConverter : IValueConverter
     {
         /// <summary>

src/Avalonia.Controls.ColorPicker/Converters/ContrastBrushConverter.cs

@@ -10,6 +10,9 @@ namespace Avalonia.Controls.Primitives.Converters
     /// Gets a <see cref="SolidColorBrush"/>, either black or white, depending on the luminance of the supplied color.
     /// A default color supplied in the converter parameter may be returned if alpha is below the set threshold.
     /// </summary>
+    /// <remarks>
+    /// This is a highly-specialized converter for the color picker.
+    /// </remarks>
     public class ContrastBrushConverter : IValueConverter
     {
         private ToColorConverter toColorConverter = new ToColorConverter();

src/Avalonia.Controls.ColorPicker/Converters/ThirdComponentConverter.cs

@@ -7,8 +7,10 @@ namespace Avalonia.Controls.Primitives.Converters
     /// <summary>
     /// Gets the third <see cref="ColorComponent"/> corresponding with a given
     /// <see cref="ColorSpectrumComponents"/> that represents the other two components.
-    /// This is a highly-specialized converter for the color picker.
     /// </summary>
+    /// <remarks>
+    /// This is a highly-specialized converter for the color picker.
+    /// </remarks>
     public class ThirdComponentConverter : IValueConverter
     {
         /// <inheritdoc/>