[NRBF] List all exceptions that can be thrown by the decoder (#106138)

* TypeName.DeclaringType is not nullable, it throws an exception when the type is not nested (src already does that, ref needs to reflect it)

* fix a typo (we don't take into account member (field) types, not just generic types)

* add NotSupportedException to the list of exceptions the decoder can throw

* add EndOfStreamException to the list of exceptions the decoder can throw

src/libraries/System.Formats.Nrbf/src/System/Formats/Nrbf/NrbfDecoder.cs

@@ -107,8 +107,15 @@ public static bool StartsWithPayloadHeader(Stream stream)
     /// <exception cref="ArgumentNullException"><paramref name="payload"/> is <see langword="null" />.</exception>
     /// <exception cref="ArgumentException"><paramref name="payload"/> does not support reading or is already closed.</exception>
     /// <exception cref="SerializationException">Reading from <paramref name="payload"/> encounters invalid NRBF data.</exception>
+    /// <exception cref="NotSupportedException">
+    /// Reading from <paramref name="payload"/> encounters not supported records.
+    /// For example, arrays with non-zero offset or not supported record types
+    /// (<see cref="SerializationRecordType.ClassWithMembers"/>, <see cref="SerializationRecordType.SystemClassWithMembers"/>,
+    /// <see cref="SerializationRecordType.MethodCall"/> or <see cref="SerializationRecordType.MethodReturn"/>).
+    /// </exception>
     /// <exception cref="DecoderFallbackException">Reading from <paramref name="payload"/>
     /// encounters an invalid UTF8 sequence.</exception>
+    /// <exception cref="EndOfStreamException">The end of the stream is reached before reading <see cref="SerializationRecordType.MessageEnd"/> record.</exception>
     public static SerializationRecord Decode(Stream payload, PayloadOptions? options = default, bool leaveOpen = false)
         => Decode(payload, out _, options, leaveOpen);
 

src/libraries/System.Formats.Nrbf/src/System/Formats/Nrbf/SerializationRecord.cs

@@ -46,7 +46,7 @@ internal SerializationRecord() // others can't derive from this type
     /// </summary>
     /// <remarks>
     /// <para>This method ignores assembly names.</para>
-    /// <para>This method does NOT take into account member names or their generic types.</para>
+    /// <para>This method does NOT take into account member names or their types.</para>
     /// </remarks>
     /// <param name="type">The type to compare against.</param>
     /// <returns><see langword="true" /> if the serialized type name match provided type; otherwise, <see langword="false" />.</returns>

src/libraries/System.Reflection.Metadata/ref/System.Reflection.Metadata.cs

@@ -2427,7 +2427,7 @@ public sealed partial class TypeName
         internal TypeName() { }
         public string AssemblyQualifiedName { get { throw null; } }
         public AssemblyNameInfo? AssemblyName { get { throw null; } }
-        public System.Reflection.Metadata.TypeName? DeclaringType { get { throw null; } }
+        public System.Reflection.Metadata.TypeName DeclaringType { get { throw null; } }
         public string FullName { get { throw null; } }
         public bool IsArray { get { throw null; } }
         public bool IsByRef { get { throw null; } }