Github says the data is stored in Google spreadsheets and that how to find that Google spreadsheet is on the main website, but I don't see those instructions on the main website.
I found a discussion topic in this forum that makes it seem very difficult for users to make corrections to existing data. Surely this can't be true.
So I'm asking this question here to get an authoritative answer as to:
What is the process for making corrections to existing data?