Remove no longer valid comments

src/ImageSharp/Formats/Tiff/PhotometricInterpretation/BlackIsZero24TiffColor{TPixel}.cs

@@ -26,8 +26,6 @@ namespace SixLabors.ImageSharp.Formats.Tiff.PhotometricInterpretation
         /// <inheritdoc/>
         public override void Decode(ReadOnlySpan<byte> data, Buffer2D<TPixel> pixels, int left, int top, int width, int height)
         {
-            // Note: due to an issue with netcore 2.1 and default values and unpredictable behavior with those,
-            // we define our own defaults as a workaround. See: https://github.com/dotnet/runtime/issues/55623
             var color = default(TPixel);
             color.FromScaledVector4(Vector4.Zero);
             byte[] buffer = new byte[4];

src/ImageSharp/Formats/Tiff/PhotometricInterpretation/RgbFloat323232TiffColor{TPixel}.cs

@@ -26,8 +26,6 @@ namespace SixLabors.ImageSharp.Formats.Tiff.PhotometricInterpretation
         /// <inheritdoc/>
         public override void Decode(ReadOnlySpan<byte> data, Buffer2D<TPixel> pixels, int left, int top, int width, int height)
         {
-            // Note: due to an issue with netcore 2.1 and default values and unpredictable behavior with those,
-            // we define our own defaults as a workaround. See: https://github.com/dotnet/runtime/issues/55623
             var color = default(TPixel);
             color.FromScaledVector4(Vector4.Zero);
             int offset = 0;

src/ImageSharp/Formats/Tiff/PhotometricInterpretation/WhiteIsZero16TiffColor{TPixel}.cs

@@ -26,8 +26,6 @@ namespace SixLabors.ImageSharp.Formats.Tiff.PhotometricInterpretation
         /// <inheritdoc/>
         public override void Decode(ReadOnlySpan<byte> data, Buffer2D<TPixel> pixels, int left, int top, int width, int height)
         {
-            // Note: due to an issue with netcore 2.1 and default values and unpredictable behavior with those,
-            // we define our own defaults as a workaround. See: https://github.com/dotnet/runtime/issues/55623
             L16 l16 = TiffUtils.L16Default;
             var color = default(TPixel);
             color.FromScaledVector4(Vector4.Zero);

src/ImageSharp/Formats/Tiff/PhotometricInterpretation/WhiteIsZero24TiffColor{TPixel}.cs

@@ -26,8 +26,6 @@ namespace SixLabors.ImageSharp.Formats.Tiff.PhotometricInterpretation
         /// <inheritdoc/>
         public override void Decode(ReadOnlySpan<byte> data, Buffer2D<TPixel> pixels, int left, int top, int width, int height)
         {
-            // Note: due to an issue with netcore 2.1 and default values and unpredictable behavior with those,
-            // we define our own defaults as a workaround. See: https://github.com/dotnet/runtime/issues/55623
             var color = default(TPixel);
             color.FromScaledVector4(Vector4.Zero);
             byte[] buffer = new byte[4];

src/ImageSharp/Formats/Tiff/PhotometricInterpretation/WhiteIsZero32FloatTiffColor{TPixel}.cs

@@ -26,8 +26,6 @@ namespace SixLabors.ImageSharp.Formats.Tiff.PhotometricInterpretation
         /// <inheritdoc/>
         public override void Decode(ReadOnlySpan<byte> data, Buffer2D<TPixel> pixels, int left, int top, int width, int height)
         {
-            // Note: due to an issue with netcore 2.1 and default values and unpredictable behavior with those,
-            // we define our own defaults as a workaround. See: https://github.com/dotnet/runtime/issues/55623
             var color = default(TPixel);
             color.FromScaledVector4(Vector4.Zero);
             byte[] buffer = new byte[4];

src/ImageSharp/Formats/Tiff/PhotometricInterpretation/WhiteIsZero32TiffColor{TPixel}.cs

@@ -26,8 +26,6 @@ namespace SixLabors.ImageSharp.Formats.Tiff.PhotometricInterpretation
         /// <inheritdoc/>
         public override void Decode(ReadOnlySpan<byte> data, Buffer2D<TPixel> pixels, int left, int top, int width, int height)
         {
-            // Note: due to an issue with netcore 2.1 and default values and unpredictable behavior with those,
-            // we define our own defaults as a workaround. See: https://github.com/dotnet/runtime/issues/55623
             var color = default(TPixel);
             color.FromScaledVector4(Vector4.Zero);
             const uint maxValue = 0xFFFFFFFF;