docs: update incorrect urls

These were missed when git was moved to the new SF platform during Nov 2012.

Change-Id: I7b4ae9dea010d95f9bf4c26841b5b724f41768be
Signed-off-by: Spencer Oliver <spen@spen-soft.co.uk>
Reviewed-on: http://openocd.zylin.com/1248
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Tested-by: jenkins