sdk_lib: Add description to bash script

Clarify what the bash script does.

BUG=none
TEST=none

Change-Id: Id4aee2a1ae96daa7f1afd58a15bd83a37a0889db
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/1967344
Reviewed-by: Will Bradley <wbbradley@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Andrew Lassalle <andrewlassalle@chromium.org>
Tested-by: Andrew Lassalle <andrewlassalle@chromium.org>
Commit-Queue: Andrew Lassalle <andrewlassalle@chromium.org>
1 file changed