pgsql: Doc: fix typo in pgbench random_zipfian() documentation.

Doc: fix typo in pgbench random_zipfian() documentation. Per bug #15819 from Koizumi Satoru. Discussion: https://postgr.es/m/[email protected] Branch -- master Details --- https://git.postgresql.org/pg/commitdiff/591fb289c3eef010ee1bb271a54fab7da385c4cd Modified Fil

pgsql: Doc: fix typo in pgbench random_zipfian() documentation.

Doc: fix typo in pgbench random_zipfian() documentation. Per bug #15819 from Koizumi Satoru. Discussion: https://postgr.es/m/[email protected] Branch -- REL_11_STABLE Details --- https://git.postgresql.org/pg/commitdiff/329575db94cda78d467c52f71967acf26fcc5ce2 Modif