Spell checker run

doc/src/sgml/array.sgml

doc/src/sgml/backup.sgml

doc/src/sgml/catalogs.sgml

doc/src/sgml/ddl.sgml

doc/src/sgml/external-projects.sgml

doc/src/sgml/func.sgml

doc/src/sgml/installation.sgml

doc/src/sgml/libpq.sgml

doc/src/sgml/maintenance.sgml

doc/src/sgml/manage-ag.sgml

doc/src/sgml/plperl.sgml

doc/src/sgml/plpgsql.sgml

doc/src/sgml/protocol.sgml

doc/src/sgml/ref/alter_user.sgml

doc/src/sgml/ref/copy.sgml

doc/src/sgml/ref/create_cast.sgml

doc/src/sgml/ref/create_table.sgml

doc/src/sgml/ref/create_table_as.sgml

doc/src/sgml/ref/psql-ref.sgml

doc/src/sgml/release.sgml