Add missing class docs

Former-commit-id: 74c642cce368d8e8a917a71b05e06c9f59a665b8
Former-commit-id: 0b8453f330d8be2187f941ddbd4e9d81431e2cf0
Former-commit-id: 4b4a7e399c6662f0646ddb144b28fe71084a9ca8

src/ImageProcessorCore/Samplers/Processors/RotateFlipProcessor.cs

@@ -11,6 +11,8 @@ namespace ImageProcessorCore.Processors
     /// <summary>
     /// Provides methods that allow the rotation and flipping of an image around its center point.
     /// </summary>
+    /// <typeparam name="T">The pixel format.</typeparam>
+    /// <typeparam name="TP">The packed format. <example>long, float.</example></typeparam>
     public class RotateFlipProcessor<T, TP> : ImageSampler<T, TP>
         where T : IPackedVector<TP>
         where TP : struct