per CHAO Wei-Lun's patch, add missing "[dir]" and missing _()'s to the
"-E [dir]/--backupdir=[dir]" strings in usage()


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@1805 35c25a1d-7b9e-4130-9fde-d3aeb78583b8
2 files changed