Fix 404 broken links to logging and debug configuration

Signed-off-by: David Moreau Simard <dmsimard@iweb.com>
Merge pull request #1127 from dmsimard/log_links

Doc: Fix 404 broken links to logging and debug configuration

Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Reviewed-by: Loic Dachary <loic@dachary.org>