Regenerate man pages with docutils 0.17.1

Regenerate man pages with docutils 0.17.1

The Debian 10 (buster) Docker image, which GitLab CI uses for building
documentation, currently contains the following package versions:

  - Sphinx 4.2.0
  - sphinx-rtd-theme 1.0.0
  - docutils 0.17.1

Regenerate the man pages to match contents produced in a Sphinx
environment using the above package versions.  This is necessary to
prevent the "docs" GitLab CI job from failing.

(cherry picked from commit ffd1e71fdf96b8549d25f1a0d9cade4c0cdbd99a)