...
Click on CTRL and , to display the Settings Panel
Goto 'Extensions' Menu and find 'reStructuredText' line
Conf Path: ${workspaceFolder}/docs
Docutils Writer: html
Docutils Writer Part: html_body
Linter: Executable Path: /usr/bin/doc8
Linter: Name: doc8Sphinx Build Path: /usr/local/bin/sphinx-build
Note: you need to open a Folder associated with the ONAP component