[U-Boot] [PATCH] buildman: fix invocation examples typos

[sjg at google.com]

Also, make command line example indentation consistent.

Signed-off-by: Baruch Siach <baruch at tkos.co.il>
---
 tools/buildman/README | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Applied to u-boot-dm, thanks!