Fixed a few comments that still referred to FSR2

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/PostProcessLayer.cs

@@ -51,7 +51,7 @@ namespace UnityEngine.Rendering.PostProcessing
             TemporalAntialiasing,
             
             /// <summary>
-            /// FidelityFX Super Resolution 2 (FSR2).
+            /// FidelityFX Super Resolution 3 (FSR3) Upscaler.
             /// </summary>
             SuperResolution,
         }

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/PostProcessRenderContext.cs

@@ -216,7 +216,7 @@ namespace UnityEngine.Rendering.PostProcessing
         public TemporalAntialiasing temporalAntialiasing { get; internal set; }
         
         /// <summary>
-        /// A reference to the FSR2 settings for the rendering layer.
+        /// A reference to the FSR3 Upscaler settings for the rendering layer.
         /// </summary>
         public SuperResolution superResolution { get; internal set; }