docs: fix bad extras_require reference (#8969)
docs: fix bad extras_require reference (#8969)


airbnb/superset,airbnb/superset,zhouyao1994/incubator-superset,airbnb/caravel,apache/incubator-superset,mistercrunch/panoramix,zhouyao1994/incubator-superset,zhouyao1994/incubator-superset,zhouyao1994/incubator-superset,mistercrunch/panoramix,airbnb/superset,airbnb/caravel,airbnb/superset,mistercrunch/panoramix,apache/incubator-superset,airbnb/caravel,apache/incubator-superset,apache/incubator-superset,zhouyao1994/incubator-superset,mistercrunch/panoramix,apache/incubator-superset,airbnb/caravel