Use null as default for sphinx_sourcedir #140
Merged
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This is a followup to #138. The original documentation was wrong, doc/ is not a reasonable default for sphinx_sourcedir, as specifying that has the side effect of replacing the standard rosdoc2 output. That 'side effect' is actually the intended main effect of sphinx_sourcedir. We will need a new variable for the common issue that user documentation is in an alternate folder (typically docs/) but we do not want to override the default rosdoc2 output. That is a followup need.