coding style: doc: remove empty lines at end of text files
Empty lines at end of text files are useless.
Remove them.
Change-Id: I30e4d3d03c4ce846aa7bcefa7366f88732275557
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/5170
Tested-by: jenkins