Re: [DOCS] recommending change to first example in 7.8.1

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/9.6/static/queries-with.html
Description:

The first example in 7.8.1 shown below includes a field called 'quantity' to
be summed in the primary SELECT statement. I think this is a mistake. 

I do
not think this field exists in the WITH virtual table