bug#16719: typo in help string

[Trần Ngọc Quân]

Hello,
In http://meyering.net/grep/grep-2.16.14-b75c.tar.xz, you properly trail
n at the end of this help string message:
src/main.c:1537
      --help                display this help and exit\nn"));
Please fix this typo then upload new pot file to TranslationProject.org
Thanks,

-- 
Trần Ngọc Quân.