Add XML documentation to Ryujinx.Graphics.Gpu.State

Ryujinx.Graphics.Gpu/State/UniformBufferState.cs

@@ -1,5 +1,8 @@
 namespace Ryujinx.Graphics.Gpu.State
 {
+    /// <summary>
+    /// Uniform buffer state for the uniform buffer currently being modified.
+    /// </summary>
     struct UniformBufferState
     {
         public int   Size;