How did you upgrade? (ACP/one click or via a manual upload?)
If you did it via the ACP, we only replace files that were actively changed between versions, so if this file was already showing unexpected contents (because it was manually edited for example) and we didn't change the file since RC1 (I don't think we did), then the edited file will remain. You could manually reupload the file to resolve this.
If you manually uploaded the files for the upgrade, this generally indicates some sort of issue with the upload so it's probably worth manually reuploading the file.
This file isn't upgrade related in any way, so just reuploading the file should be sufficient.