[css-fonts-4] Activation should be meaningful for local fonts

Author: Litherum

css-fonts-4/Overview.bs

@@ -354,7 +354,7 @@ at least as dark as its predecessor. Only values between 1 - 999 are valid, and
 	locally-installed font face names. When a font is needed the user
 	agent iterates over the set of references listed, using the first one
 	it can successfully activate. Activation of a font involves downloading
-	the file, parsing it, and perhaps additional user-agent-dependent steps.
+	the file or reading it from disk, parsing it, and perhaps additional user-agent-dependent steps.
 	Fonts containing invalid data or local
 	font faces that are not found are ignored and the user agent loads the
 	next font in the list.