pgsql: Doc: correct spelling of meson switch.

Doc: correct spelling of meson switch. It's --auto-features not --auto_features. Reported-by: Egor Chindyaskin Discussion: https://postgr.es/m/172465652540.862882.17808523044292761...@wrigleys.postgresql.org Discussion: https://postgr.es/m/1979661.1746212...@sss.pgh.pa.us Backpatch-through: 16

pgsql: Doc: correct spelling of meson switch.

Doc: correct spelling of meson switch. It's --auto-features not --auto_features. Reported-by: Egor Chindyaskin Discussion: https://postgr.es/m/172465652540.862882.17808523044292761...@wrigleys.postgresql.org Discussion: https://postgr.es/m/1979661.1746212...@sss.pgh.pa.us Backpatch-through: 16

pgsql: Doc: correct spelling of meson switch.

Doc: correct spelling of meson switch. It's --auto-features not --auto_features. Reported-by: Egor Chindyaskin Discussion: https://postgr.es/m/172465652540.862882.17808523044292761...@wrigleys.postgresql.org Discussion: https://postgr.es/m/1979661.1746212...@sss.pgh.pa.us Backpatch-through: 16