add a note that you can clear the settings on the Gigabeat by holding A during boot

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@13281 a1c6a512-1295-4272-9138-f99709370657

manual/advanced_topics/main.tex

@@ -356,6 +356,10 @@ Example of a configuration file:
       by turning off the \dap, and turning it	back on with the hold button 
       on.}
   }
+  \opt{gigabeat}{\note{You can also reset all settings to their default values 
+      by turning off the \dap, and turning it back on with the \ButtonA 
+      button on.}
+  }
 			
 \item [Write .cfg file.]This option writes a \fname{.cfg} file to 
   your \daps\ hard disk.  The configuration file has the \fname{.cfg}