[css-fonts-4] Clarify the effect of auto values on @font-face is to select the appropriate "normal" value, w3c#9485

Author: svgeesus

css-fonts-4/Overview.bs

@@ -3057,7 +3057,10 @@ Font property descriptors: the 'font-style!!descriptor', 'font-weight!!descripto
 
 	The auto values for these three descriptors have the following effects:
 
-	- For font selection purposes, the font is selected as if the appropriate initial value is chosen
+	- For font selection purposes, the font is selected as if 
+		the appropriate normal value 
+		(''font-style/normal'', ''font-weight/normal'' or ''font-width/normal'')
+		is chosen
 	- For variation axis clamping, clamping does not occur
 
 	The value for these font face style attributes