Documentation: HOWTO: update git home URL in translations

Homepage url of git in HOWTO document was updated by commit
e234ebf7 ("Documentation/HOWTO: update
git home URL") but not applied to several translations.  This commit
updates them.

Signed-off-by: SeongJae Park <sj38.park@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>