[clang-tidy] Fixes a typo in the help message.

It contained 'thewarnings' without a space. It also fixes some odd
formatting in the text introduced by

commit dd3c26a0
Author: Tobias Hieta <tobias@hieta.se>
Date:   Wed May 17 10:56:49 2023 +0200

    [NFC][Py Reformat] Reformat python files in clang and clang-tools-extra