To be honest, I didn't know about the RAML you link until I read your comment. Would this RAML be common knowledge for people who aren't web developers / don't regularly use web APIs?
probably not. It's not super popular even among web devs. The last time I remember thinking about it was prob in 2015. I think swagger has won the market for api documentation.
That being said, its still annoying trying to find information about a project when there are conflicting names.