Describe the default value of the new optional tag parameter

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@27899 a1c6a512-1295-4272-9138-f99709370657

manual/advanced_topics/main.tex

@@ -321,7 +321,7 @@ and the WPS, but you can use multiple fonts in each of the individual screens.\\
     \item `filename' is the font filename to load. Fonts should be stored in
        \fname{/.rockbox/fonts/}
     \item `glyphs' is an optional specification of how many unique glyphs to
-       store in memory.
+       store in memory. Default is 256.
   \end{itemize}
 
   An example would be: \config{\%Fl(2,12-Nimbus.fnt,100)}