Yes, that flavor wasn't even being built. The documentation was shipped in hypre-doc.
I have left that code for now because I want to ask upstream about the possibility of shipping the documentation source again to be able to build it and in that case, I think the best would be re-using the hpc-doc flavor.
There are still some references to install_doc, e.g. from the disabled hpc-doc flavor
Yes, that flavor wasn't even being built. The documentation was shipped in hypre-doc. I have left that code for now because I want to ask upstream about the possibility of shipping the documentation source again to be able to build it and in that case, I think the best would be re-using the hpc-doc flavor.