Fix typo in header comment
Fix typo in header comment

weynhamz/GNOME-libgit2-glib,GNOME/libgit2-glib,weynhamz/GNOME-libgit2-glib,weynhamz/GNOME-libgit2-glib,chergert/libgit2-glib,chergert/libgit2-glib,weynhamz/GNOME-libgit2-glib,GNOME/libgit2-glib,chergert/libgit2-glib