doc: docker-container: Default to python3-genenetwork2 for examples
doc: docker-container: Default to python3-genenetwork2 for examples

pjotrp/genenetwork2,zsloan/genenetwork2,pjotrp/genenetwork2,zsloan/genenetwork2,genenetwork/genenetwork2,pjotrp/genenetwork2,pjotrp/genenetwork2,genenetwork/genenetwork2,pjotrp/genenetwork2,genenetwork/genenetwork2,genenetwork/genenetwork2,zsloan/genenetwork2,zsloan/genenetwork2