toolchain-utils: fix docstring-leading-whitespace lint warnings.

BUG=chromium:570458
TEST='crosperf/run_tests.sh' passes.

Change-Id: I5f8cb5a89faa8d7f17d7b20a2198317a6f89b6d1
Reviewed-on: https://chrome-internal-review.googlesource.com/243455
Commit-Ready: Rahul Chaudhry <rahulchaudhry@google.com>
Tested-by: Rahul Chaudhry <rahulchaudhry@google.com>
Reviewed-by: Caroline Tice <cmtice@google.com>
1 file changed