Fix typo et al. (#339)

* Fix typo et al.

* Remove outdated item metadata.

* Address PR feedback.

Author: teo-tsirpanis

src/Microsoft.DiaSymReader/Extensions/SymUnmanagedExtensions.Scope.cs

@@ -78,7 +78,7 @@ public static ISymUnmanagedConstant[] GetConstants(this ISymUnmanagedScope scope
                     throw new ArgumentNullException(nameof(scope));
                 }
 
-                return EmptyArray<ISymUnmanagedConstant>.Instance;
+                return [];
             }
 
             return scope2.GetConstants();

src/Microsoft.DiaSymReader/Utilities/IUnsafeComStream.cs

@@ -18,7 +18,7 @@ namespace Microsoft.DiaSymReader
 {
     /// <summary>
     /// This is a re-definition of COM's IStream interface. The important change is that
-    /// the Read and Write methods take an <see cref="IntPtr"/> instead of a byte[] to avoid the
+    /// the Read and Write methods take a pointer instead of a byte[] to avoid the
     /// allocation cost when called from native code.
     /// </summary>
     [Guid("0000000c-0000-0000-C000-000000000046"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
@@ -42,7 +42,7 @@ internal unsafe partial interface IUnsafeComStream
     }
 
 #if NET9_0_OR_GREATER
-    [NativeMarshalling(typeof(STASTGMarshaller))]
+    [NativeMarshalling(typeof(STATSTGMarshaller))]
     public struct STATSTG
     {
         public string pwcsName;
@@ -58,9 +58,9 @@ public struct STATSTG
         public int reserved;
     }
 
-    [CustomMarshaller(typeof(STATSTG), MarshalMode.ManagedToUnmanagedOut, typeof(STASTGMarshaller))]
-    [CustomMarshaller(typeof(STATSTG), MarshalMode.UnmanagedToManagedOut, typeof(STASTGMarshaller))]
-    public static unsafe class STASTGMarshaller
+    [CustomMarshaller(typeof(STATSTG), MarshalMode.ManagedToUnmanagedOut, typeof(STATSTGMarshaller))]
+    [CustomMarshaller(typeof(STATSTG), MarshalMode.UnmanagedToManagedOut, typeof(STATSTGMarshaller))]
+    public static unsafe class STATSTGMarshaller
     {
         public struct Native
         {

src/Microsoft.DiaSymReader/Utilities/InteropUtilities.cs

@@ -8,16 +8,11 @@
 
 namespace Microsoft.DiaSymReader
 {
-    internal static class EmptyArray<T>
-    {
-        public static readonly T[] Instance = new T[0];
-    }
-
     internal class InteropUtilities
     {
         private static readonly IntPtr s_ignoreIErrorInfo = new IntPtr(-1);
 
-        internal static T[] NullToEmpty<T>(T[] items) => (items == null) ? EmptyArray<T>.Instance : items;
+        internal static T[] NullToEmpty<T>(T[] items) => items == null ? [] : items;
 
         internal static void ThrowExceptionForHR(int hr)
         {