DOC: Add notes explaining params is db driver dep. GH7573
Merge pull request #8266 from jnmclarty/SQL_params_note

DOC: Add notes explaining params is db driver dep. GH7573
ENH groupby: more user-friendly error message (GH7511)
Merge pull request #8281 from bthyreau/fix_grouper_errormessage

ENH groupby: more user-friendly error message (GH7511)