update comments
Fix coding style

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

This fixes a build breakage with CONFIG_API enabled, which appeared after
the recent changes in the U-Boot build system.

Signed-off-by: Rafal Jaworowski <raj@semihalf.com>

Signed-off-by: Wolfgang Denk <wd@denx.de>

This is an API for external (standalone) applications running on top of
U-Boot, and is meant to be more extensible and robust than the existing
jumptable mechanism. It is similar to UNIX syscall approach. See api/README
for more details.

Included is the demo application using this new framework (api_examples).

Please note this is still an experimental feature, and is turned off by
default.

Signed-off-by: Rafal Jaworowski <raj@semihalf.com>