[css-fonts-4][editorial] typo, w3c#6916

Author: svgeesus

css-fonts-4/Overview.bs

@@ -7050,7 +7050,7 @@ Font family: the 'font-family!!descriptor' descriptor</h4>
     This descriptor defines the font families that this palette applies to.
     This palette will only ever be applied to the fonts with these family names.
     The value of this descriptor  means that only named font families are allowed
-    and rules that including generic fonts in the list of font families
+    and rules that include generic fonts in the list of font families
     are syntax errors.
     If syntax errors occur within the font family list, the descriptor must be ignored.