[fixes] update descriptions of tools

[cdpath]

Thanks for your contribution and we appreciate it a lot. The following instructions would make your pull request more healthy and more easily get feedback. If you do not understand some items, don't worry, just make the pull request and seek help from maintainers.

Motivation

Make descriptions of tools more relevant.

Modification

Updated argparse.ArgumentParser's description

Checklist

Before PR:

• Pre-commit or other linting tools are used to fix the potential lint issues.
• Bug fixes are fully covered by unit tests, the case that causes the bug should be added in the unit tests.
• The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• The documentation has been modified accordingly, like docstring or example tutorials.

After PR:

• If the modification has potential influence on downstream or other related projects, this PR should be tested with those projects.
• CLA has been signed and all committers have signed the CLA in this PR.

[gaotongxiao]

LGTM

[gaotongxiao]

Thanks for your contribution! The linting test seems not passed.

You can install pre-commit hooks to automatically fix this issue:

pip install -U pre-commit
pre-commit install
pre-commit run --all-files
git add --update
git commit

[tonysy]

Please fix the lint issue

[gaotongxiao]

Thanks!

done