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1229: Fix docs warnings r=mergify[bot] a=muhlemmer ## What type of PR? Documentation ## What does this PR do? 1. Fix various build warnings from Sphinx that sneaked into the project over time, and fixed them. 2. Enable the `-W` option for `sphinx-build` to elevate `warning` to `error` in order to make build fail in case of syntax errors. This will give a better feedback from Travis to Pull Requests with Documentation updates. They will now block in case of syntax errors, so we don;t have to cleanup afterwards. ### Related issue(s) None ## Prerequistes N/A Co-authored-by: Tim Möhlmann <muhlemmer@gmail.com>