pgsql: doc: fix typo in create role manual.

doc: fix typo in create role manual. There was a small mistake in the create role manual. Author: Satoru Koizumi Reviewed-by: David G. Johnston Discussion: https://postgr.es/m/flat/20240616.112523.1208348667552014162.t-ishii%40sranhm.sra.co.jp Backpatch-through: 16 Branch -- REL_16_STABLE

pgsql: doc: fix typo in create role manual.

doc: fix typo in create role manual. There was a small mistake in the create role manual. Author: Satoru Koizumi Reviewed-by: David G. Johnston Discussion: https://postgr.es/m/flat/20240616.112523.1208348667552014162.t-ishii%40sranhm.sra.co.jp Backpatch-through: 16 Branch -- master Details