1 - Create a new ScoTube with the correct description -> export -> import as a new version
2 - Export the ScoTube -> unzip -> open the metadata.xml file and change the description tag to the correct description and save. Then open the config.json file -> update the description being sure to use shift + quote around the title* -> save. Re-zip the course from inside the folder and import as a new version.
*For some reason when you open the config.json file it changes the position of the quotes which will cause an error. It's strange. I've opened a ticket to look into this.