that example is intending to produce a single column result that concatenates two fields into a comma-separated string, e.g. "your name, you@somesite.com".
I think jumping into that example directly is probably kind of disorienting. The SQL in that string is a little bit weird/contorted just to illustrate, "it's text, do whatever you want!". I also wrote that example like ten years ago.
Oh OK I get it, it makes perfect sense but yes, jumping to that example directly might be disorienting.
Maybe a one-line explanation (just like the one you gave me) placed immediately above or below the code example would make it more readable!
I think jumping into that example directly is probably kind of disorienting. The SQL in that string is a little bit weird/contorted just to illustrate, "it's text, do whatever you want!". I also wrote that example like ten years ago.