Comments, quantization table scaling with clamp call

src/ImageSharp/Formats/Jpeg/Components/Quantization.cs

@@ -179,19 +179,8 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components
             Block8x8F table = default;
             for (int j = 0; j < Block8x8F.Size; j++)
             {
-                int x = unscaledTable[j];
-                x = ((x * scale) + 50) / 100;
-                if (x < 1)
-                {
-                    x = 1;
-                }
-
-                if (x > 255)
-                {
-                    x = 255;
-                }
-
-                table[j] = x;
+                int x = ((unscaledTable[j] * scale) + 50) / 100;
+                table[j] = Numerics.Clamp(x, 1, 255);
             }
 
             return table;

src/ImageSharp/Formats/Jpeg/JpegMetadata.cs

@@ -11,7 +11,14 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
     /// </summary>
     public class JpegMetadata : IDeepCloneable
     {
+        /// <summary>
+        /// Backing field for <see cref="LuminanceQuality"/>
+        /// </summary>
         private int? luminanceQuality;
+
+        /// <summary>
+        /// Backing field for <see cref="ChrominanceQuality"/>
+        /// </summary>
         private int? chrominanceQuality;
 
         /// <summary>