Fix some unwanted empty lines in the manual.

Inside a code environment lines opted out will remain as empty lines.
Use a feature of fancyvrb to only show one specific line from the code
block to avoid this.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29194 a1c6a512-1295-4272-9138-f99709370657
1 file changed