Adding documentation to enums.

src/ImageSharp/Formats/Jpg/Components/MutableSpan.cs

@@ -14,7 +14,7 @@ namespace ImageSharp.Formats
     /// <see>
     ///     <cref>https://github.com/dotnet/corefxlab/blob/master/src/System.Slices/System/Span.cs</cref>
     /// </see>
-    /// <typeparam name="T"></typeparam>
+    /// <typeparam name="T">The type of the data in the span</typeparam>
     internal struct MutableSpan<T>
     {
         /// <summary>

src/ImageSharp/Formats/Jpg/Components/YCbCrImage.cs

@@ -44,16 +44,34 @@ namespace ImageSharp.Formats
         /// </summary>
         public enum YCbCrSubsampleRatio
         {
+            /// <summary>
+            /// YCbCrSubsampleRatio444
+            /// </summary>
             YCbCrSubsampleRatio444,
 
+            /// <summary>
+            /// YCbCrSubsampleRatio422
+            /// </summary>
             YCbCrSubsampleRatio422,
 
+            /// <summary>
+            /// YCbCrSubsampleRatio420
+            /// </summary>
             YCbCrSubsampleRatio420,
 
+            /// <summary>
+            /// YCbCrSubsampleRatio440
+            /// </summary>
             YCbCrSubsampleRatio440,
 
+            /// <summary>
+            /// YCbCrSubsampleRatio411
+            /// </summary>
             YCbCrSubsampleRatio411,
 
+            /// <summary>
+            /// YCbCrSubsampleRatio410
+            /// </summary>
             YCbCrSubsampleRatio410,
         }
 

src/ImageSharp/Formats/Jpg/JpegDecoderCore.cs

@@ -224,7 +224,14 @@ namespace ImageSharp.Formats
         /// </summary>
         internal enum ErrorCodes
         {
+            /// <summary>
+            /// NoError
+            /// </summary>
             NoError,
+
+            /// <summary>
+            /// MissingFF00
+            /// </summary>
             MissingFF00
         }