add scripts for converting man pages via pandoc

Add the scripts to convert the man pages to markdown, and refresh the
man pages again with the latest pandoc version which has slightly diff
generated output, but should basically render the same.

Change-Id: I509a42e3fb5b50e857bd30c70b28813f7e1c1223
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/minijail/+/3983646
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
4 files changed