All reports of source-contains-prebuilt-sphinx-documentation for the archive. The extended description of this tag is:
The source tarball contains prebuilt Sphinx documentation. This is usually left by mistake when generating the tarball without first cleaning the source directory. You may want to report this as an upstream bug if there is no sign that this was intended.
It is preferable to rebuild documentation directly from source.
This tag has not been emitted in any package tested by Lintian.