Fixed some remaining unit tests

Author: Sergio0694

UnitTests/UnitTests.HighPerformance.Shared/Memory/Test_Memory2D{T}.cs

@@ -536,7 +536,7 @@ public void Test_Memory2DT_ToString()
             // Here we just want to verify that the type is nicely printed as expected, along with the size
             string text = memory2d.ToString();
 
-            const string expected = "Microsoft.Toolkit.HighPerformance.Memory.Memory2D<System.Int32>[2, 3]";
+            const string expected = "Microsoft.Toolkit.HighPerformance.Memory2D<System.Int32>[2, 3]";
 
             Assert.AreEqual(text, expected);
         }

UnitTests/UnitTests.HighPerformance.Shared/Memory/Test_ReadOnlyMemory2D{T}.cs

@@ -484,7 +484,7 @@ public void Test_ReadOnlyMemory2DT_ToString()
 
             string text = memory2d.ToString();
 
-            const string expected = "Microsoft.Toolkit.HighPerformance.Memory.ReadOnlyMemory2D<System.Int32>[2, 3]";
+            const string expected = "Microsoft.Toolkit.HighPerformance.ReadOnlyMemory2D<System.Int32>[2, 3]";
 
             Assert.AreEqual(text, expected);
         }

UnitTests/UnitTests.HighPerformance.Shared/Memory/Test_ReadOnlySpan2D{T}.cs

@@ -636,7 +636,7 @@ public void Test_ReadOnlySpan2DT_ToString()
 
             string text = span2d.ToString();
 
-            const string expected = "Microsoft.Toolkit.HighPerformance.Memory.ReadOnlySpan2D<System.Int32>[2, 3]";
+            const string expected = "Microsoft.Toolkit.HighPerformance.ReadOnlySpan2D<System.Int32>[2, 3]";
 
             Assert.AreEqual(text, expected);
         }

UnitTests/UnitTests.HighPerformance.Shared/Memory/Test_Span2D{T}.cs

@@ -823,7 +823,7 @@ public void Test_Span2DT_ToString()
             // Verify that we get the nicely formatted string
             string text = span2d.ToString();
 
-            const string expected = "Microsoft.Toolkit.HighPerformance.Memory.Span2D<System.Int32>[2, 3]";
+            const string expected = "Microsoft.Toolkit.HighPerformance.Span2D<System.Int32>[2, 3]";
 
             Assert.AreEqual(text, expected);
         }