pgsql: Doc: correct nitpicky mistakes in array_position/array_positions

Doc: correct nitpicky mistakes in array_position/array_positions examples. Daniel Gustafsson and Erik Rijkers, per report from nick@cleaton Discussion: https://postgr.es/m/[email protected] Branch -- master Details --- https://git.postgresql.

pgsql: Doc: correct nitpicky mistakes in array_position/array_positions

Doc: correct nitpicky mistakes in array_position/array_positions examples. Daniel Gustafsson and Erik Rijkers, per report from nick@cleaton Discussion: https://postgr.es/m/[email protected] Branch -- REL_13_STABLE Details --- https://git.post