Auto-generate files after cl/583411456
diff --git a/csharp/src/Google.Protobuf.Test/testprotos.pb b/csharp/src/Google.Protobuf.Test/testprotos.pb
index 9527755..a33cfa7 100644
--- a/csharp/src/Google.Protobuf.Test/testprotos.pb
+++ b/csharp/src/Google.Protobuf.Test/testprotos.pb
Binary files differ
diff --git a/csharp/src/Google.Protobuf/Reflection/Descriptor.pb.cs b/csharp/src/Google.Protobuf/Reflection/Descriptor.pb.cs
index 2421d98..208e5fe 100644
--- a/csharp/src/Google.Protobuf/Reflection/Descriptor.pb.cs
+++ b/csharp/src/Google.Protobuf/Reflection/Descriptor.pb.cs
@@ -3387,12 +3387,12 @@
/// If true, this is a proto3 "optional". When a proto3 field is optional, it
/// tracks presence regardless of field type.
///
- /// When proto3_optional is true, this field must be belong to a oneof to
- /// signal to old proto3 clients that presence is tracked for this field. This
- /// oneof is known as a "synthetic" oneof, and this field must be its sole
- /// member (each proto3 optional field gets its own synthetic oneof). Synthetic
- /// oneofs exist in the descriptor only, and do not generate any API. Synthetic
- /// oneofs must be ordered after all "real" oneofs.
+ /// When proto3_optional is true, this field must belong to a oneof to signal
+ /// to old proto3 clients that presence is tracked for this field. This oneof
+ /// is known as a "synthetic" oneof, and this field must be its sole member
+ /// (each proto3 optional field gets its own synthetic oneof). Synthetic oneofs
+ /// exist in the descriptor only, and do not generate any API. Synthetic oneofs
+ /// must be ordered after all "real" oneofs.
///
/// For message fields, proto3_optional doesn't create any semantic change,
/// since non-repeated message fields always track presence. However it still
