Ref https://jenkins.onap.org/job/doc-rules/716/console
[doc-rules] $ /bin/bash /tmp/jenkins7424274790708124458.sh

• Starting additional checks related to documentation.
• See
  https://git.onap.org/doc/doc-best-practice
  for example config files (master branch).
• Modify example config files if you like to use them in a release branch.
• See
  https://wiki.onap.org/x/w4IEBw
  for the detailed procedure #02.
• In case of questions please contact the ONAP documentation team.
• docs/index.rst found.
• docs/conf.py found.
• docs/requirements-docs.txt found.
• docs/_static/css/ribbon.css found.
• docs/conf.yaml not found.
• docs/tox.ini found.
• sphinx-build option '-W' missing in docs/tox.ini, line 13. Please add it.
• sphinx-build option '-W' used in docs/tox.ini, line 34.
• docs/_static/css/ribbon.css found.
• Setting 'max-width: 800px' found in docs/_static/css/ribbon.css.
• Please fix the detected documentation problem(s)!
  Build step 'Execute shell' marked build as failure
  Finished: FAILURE