Added documentation to generated code.

There are now summaries for:
- The Types nested class (which holds nested types)
- The file descriptor class for each proto
- The enum generated for each oneof

(Also fixed two typos.)

Generated code in next commit.

1 files changed, 1 insertions, 1 deletions

diff --git a/csharp/src/Google.Protobuf/Reflection/FieldDescriptor.cs b/csharp/src/Google.Protobuf/Reflection/FieldDescriptor.cs
index 901cbf47..619a6ac8 100644
--- a/csharp/src/Google.Protobuf/Reflection/FieldDescriptor.cs
+++ b/csharp/src/Google.Protobuf/Reflection/FieldDescriptor.cs
@@ -252,7 +252,7 @@ namespace Google.Protobuf.Reflection
             {
                 if (fieldType != FieldType.Message)
                 {
-                    throw new InvalidOperationException("MessageType is only valid for enum fields.");
+                    throw new InvalidOperationException("MessageType is only valid for message fields.");
                 }
                 return messageType;
             }