util/chromeos: revise description for more utility scripts in future

The description.md and README.md was explicitly made for downloading or
extracting some resources, but we need to add more Chrome OS related
scripts soon; so the description should be revised.

Also changed README.md for better markdown style, for example
 - Use #, ## to replace the old '-' headers
 - Use code format for file names
 - Use code block for example of shell execution

Change-Id: Icc3677fa318b03f4aee1b0f5fb13b2095f2afe64
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35664
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

0 files changed, 0 insertions, 0 deletions