added notes about generating images (#7084)
added notes about generating images (#7084)


twosigma/beaker-notebook,twosigma/beaker-notebook,twosigma/beakerx,twosigma/beakerx,jpallas/beakerx,twosigma/beakerx,jpallas/beakerx,jpallas/beakerx,jpallas/beakerx,twosigma/beakerx,twosigma/beakerx,twosigma/beaker-notebook,jpallas/beakerx,twosigma/beaker-notebook,twosigma/beaker-notebook,twosigma/beakerx,jpallas/beakerx