Add docs for pgx/stdlib
Add docs for pgx/stdlib

josephglanville/pgx,silviucm/pgx,plopik/pgx,rsto/pgx,jackc/pgx,jackc/pgx,plopik/pgx,jonasi/pgx,silviucm/pgx,silviucm/pgx,jackc/pgx,kelvich/pgx,plopik/pgx,deoxxa/pgx,jackc/pgx