[css-fonts-4] typo: miscounted number of generic font families

[mlc]

css-fonts-4 section 2.1.1 begins by describing behavior for "all five generic font families", but then goes on to list nine such families. I would suggest removing the word "five" (twice in the same sentence), replacing it with "nine" (ditto), or explaining how five of the families behave differently from the other four.

Thanks!

[litherum]

We should just remove the redundant numbers altogether.

[litherum]

64a6f62

[litherum]

d219169

[mlc]

thanks for having a look!