Add example to reflog method

Signed-off-by: Stefan Widgren <stefan.widgren@gmail.com>
Fix path comment in build_Makevars.r

* scripts/build_Makevars.r: Fix comment generated in Makevars.in and
  Makevars.Win to correct path.

Signed-off-by: Stefan Widgren <stefan.widgren@gmail.com>
Rebuild Makevars.in and Makevars.win

Signed-off-by: Stefan Widgren <stefan.widgren@gmail.com>