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As per the ONAP documentation for ReadTheDocs structure, SDN-R documentation is placed in the ccsdk/features/docs/.
ONAP documentation for SDN-R is
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currently available under the location SDN-R ReadTheDocs
ReadTheDocs for SDN-R will be moved to the new location under https://docs.onap.org/en/latest/guides/onap-developer/developing/index.html
To move to the above location , have modified index.rst in the below location which points to the SDN-R documentation which is under ccsdk/features.
doc/docs/guides/onap-developer/developing/index.rst