As this is the default ‘getting started link’, clarify pre-requisites. (#3078)
As this is the default ‘getting started link’, clarify pre-requisites. (#3078)


markusthoemmes/openwhisk,RSulzmann/openwhisk,jeremiaswerner/openwhisk,markusthoemmes/openwhisk,houshengbo/openwhisk,openwhisk/openwhisk,dubeejw/openwhisk,markusthoemmes/openwhisk,houshengbo/openwhisk,sven-lange-last/openwhisk,sven-lange-last/openwhisk,rabbah/openwhisk,csantanapr/incubator-openwhisk,openwhisk/openwhisk,csantanapr/incubator-openwhisk,cbickel/openwhisk,csantanapr/incubator-openwhisk,style95/openwhisk,openwhisk/openwhisk,starpit/openwhisk,style95/openwhisk,dubeejw/openwhisk,style95/openwhisk,houshengbo/openwhisk,RSulzmann/openwhisk,dubeejw/openwhisk,akrabat/openwhisk,houshengbo/openwhisk,openwhisk/openwhisk,csantanapr/incubator-openwhisk,markusthoemmes/openwhisk,jeremiaswerner/openwhisk,sven-lange-last/openwhisk,cbickel/openwhisk,akrabat/openwhisk,csantanapr/incubator-openwhisk,csantanapr/incubator-openwhisk,jeremiaswerner/openwhisk,RSulzmann/openwhisk,cbickel/openwhisk,csantanapr/incubator-openwhisk,cbickel/openwhisk,akrabat/openwhisk,houshengbo/openwhisk,cbickel/openwhisk,sven-lange-last/openwhisk,jeremiaswerner/openwhisk,sven-lange-last/openwhisk,markusthoemmes/openwhisk,starpit/openwhisk,cbickel/openwhisk,dubeejw/openwhisk,starpit/openwhisk,jasonpet/openwhisk,starpit/openwhisk,houshengbo/openwhisk,jeremiaswerner/openwhisk,markusthoemmes/openwhisk,markusthoemmes/openwhisk,style95/openwhisk,rabbah/openwhisk,starpit/openwhisk,rabbah/openwhisk,jeremiaswerner/openwhisk,akrabat/openwhisk,openwhisk/openwhisk,jasonpet/openwhisk,rabbah/openwhisk,starpit/openwhisk,RSulzmann/openwhisk,style95/openwhisk,akrabat/openwhisk,dubeejw/openwhisk,RSulzmann/openwhisk,jasonpet/openwhisk,sven-lange-last/openwhisk,jeremiaswerner/openwhisk,RSulzmann/openwhisk,style95/openwhisk,dubeejw/openwhisk,style95/openwhisk,jasonpet/openwhisk,openwhisk/openwhisk,akrabat/openwhisk,jasonpet/openwhisk,akrabat/openwhisk,jasonpet/openwhisk,sven-lange-last/openwhisk,houshengbo/openwhisk,rabbah/openwhisk,markusthoemmes/openwhisk,jasonpet/openwhisk,cbickel/openwhisk,rabbah/openwhisk,rabbah/openwhisk,RSulzmann/openwhisk