Fix sphinx build

Author: bsipocz

astroquery/gaia/core.py

@@ -194,7 +194,7 @@ def load_data(self, ids, *, data_release=None, data_structure='INDIVIDUAL', retr
             retrieval type identifier. For GAIA DR2 possible values are ['EPOCH_PHOTOMETRY']
             For GAIA DR3, possible values are ['EPOCH_PHOTOMETRY', 'RVS', 'XP_CONTINUOUS', 'XP_SAMPLED',
             'MCMC_GSPPHOT' or 'MCMC_MSC']
-             For GAIA DR4, possible values will be ['EPOCH_PHOTOMETRY', 'RVS', 'XP_CONTINUOUS', 'XP_SAMPLED',
+            For GAIA DR4, possible values will be ['EPOCH_PHOTOMETRY', 'RVS', 'XP_CONTINUOUS', 'XP_SAMPLED',
             'MCMC_GSPPHOT', 'MCMC_MSC', 'EPOCH_ASTROMETRY', 'RVS_EPOCH_DATA_SINGLE',
             'RVS_EPOCH_DATA_DOUBLE','RVS_EPOCH_SPECTRUM', 'RVS_TRANSIT', 'EPOCH_ASTROMETRY_CROWDED_FIELD',
             'EPOCH_IMAGE', 'EPOCH_PHOTOMETRY_CCD', 'XP_EPOCH_SPECTRUM_SSO', 'XP_EPOCH_CROWDING', 'XP_MEAN_SPECTRUM',