The current practice is:
git/Documentation$ git grep "'HEAD'" | wc -l
24
git/Documentation$ git grep "\`HEAD\`" | wc -l
66
Let's adopt the majority as a guideline.
Signed-off-by: Matthieu Moy <Matthieu.Moy@imag.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>