Update values in the external coinc table to show all available values
Currently the value in the `external_coinc` table show a handfull of possible values but a better design would be to display all values: https://git.ligo.org/emfollow/userguide/-/blob/9365b48afc54161ca1f2c9fd9ad31152b9c3391a/content.rst Some changes could also include: `{{Fermi,Swift}}` => `{{Fermi,Swift,INTEGRAL,AGILE}}` `{{GRB,SubGRB}}` => `{{GRB,SubGRB,SubGRBTargeted}}`
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