fonts: adding default values

basis/fonts/fonts-docs.factor

@@ -35,12 +35,21 @@ ARTICLE: "fonts" "Fonts"
     font-with-foreground
     font-with-background
 }
-"Useful constants:"
+"Useful constructors:"
 { $subsections
     monospace-font
     sans-serif-font
     serif-font
 }
+"Variables controlling default values:"
+{ $subsections
+    default-font-size
+    default-font-foreground
+    default-font-background
+    default-monospace-font-name
+    default-sans-serif-font-name
+    default-serif-font-name
+}
 "A data type for font metrics. The " { $vocab-link "fonts" } " vocabulary does not provide any means of computing font metrics, it simply defines a common data type that other vocabularies, such as " { $vocab-link "ui.text" } " may use:"
 { $subsections metrics } ;