Update the comment on the message_type to cover what it should be.

conformance/conformance.proto

@@ -78,7 +78,9 @@ message ConformanceRequest {
   // Which format should the testee serialize its message to?
   WireFormat requested_output_format = 3;
 
-  // should be set to either "proto2" or "proto3"
+  // The full name for the test message to use; for the moment, either:
+  // protobuf_test_messages.proto3.TestAllTypesProto3 or
+  // protobuf_test_messages.proto2.TestAllTypesProto2.
   string message_type = 4;
 }
 

csharp/src/Google.Protobuf.Conformance/Conformance.cs

@@ -142,7 +142,9 @@ namespace Conformance {
     public const int MessageTypeFieldNumber = 4;
     private string messageType_ = "";
     /// <summary>
-    /// should be set to either "proto2" or "proto3"
+    /// The full name for the test message to use; for the moment, either:
+    /// protobuf_test_messages.proto3.TestAllTypesProto3 or
+    /// protobuf_test_messages.proto2.TestAllTypesProto2.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public string MessageType {

csharp/src/Google.Protobuf.Test/TestProtos/TestMessagesProto3.cs

@@ -198,9 +198,9 @@ namespace ProtobufTestMessages.Proto3 {
             "AjgBIjkKCk5lc3RlZEVudW0SBwoDRk9PEAASBwoDQkFSEAESBwoDQkFaEAIS",
             "EAoDTkVHEP///////////wFCDQoLb25lb2ZfZmllbGQiGwoORm9yZWlnbk1l",
             "c3NhZ2USCQoBYxgBIAEoBSpACgtGb3JlaWduRW51bRIPCgtGT1JFSUdOX0ZP",
-            "TxAAEg8KC0ZPUkVJR05fQkFSEAESDwoLRk9SRUlHTl9CQVoQAkIvCihjb20u",
-            "Z29vZ2xlLnByb3RvYnVmX3Rlc3RfbWVzc2FnZXMucHJvdG8zSAH4AQFiBnBy",
-            "b3RvMw=="));
+            "TxAAEg8KC0ZPUkVJR05fQkFSEAESDwoLRk9SRUlHTl9CQVoQAkI4Cihjb20u",
+            "Z29vZ2xlLnByb3RvYnVmX3Rlc3RfbWVzc2FnZXMucHJvdG8zSAH4AQGiAgZQ",
+            "cm90bzNiBnByb3RvMw=="));
       descriptor = pbr::FileDescriptor.FromGeneratedCode(descriptorData,
           new pbr::FileDescriptor[] { global::Google.Protobuf.WellKnownTypes.AnyReflection.Descriptor, global::Google.Protobuf.WellKnownTypes.DurationReflection.Descriptor, global::Google.Protobuf.WellKnownTypes.FieldMaskReflection.Descriptor, global::Google.Protobuf.WellKnownTypes.StructReflection.Descriptor, global::Google.Protobuf.WellKnownTypes.TimestampReflection.Descriptor, global::Google.Protobuf.WellKnownTypes.WrappersReflection.Descriptor, },
           new pbr::GeneratedClrTypeInfo(new[] {typeof(global::ProtobufTestMessages.Proto3.ForeignEnum), }, new pbr::GeneratedClrTypeInfo[] {