Replace double quote to single quote.

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
Added space before \(.

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
rendering pgp key automatically.

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>