some small doc fixes
some small doc fixes

larsth/sqlx,beni55/sqlx,wmydz1/sqlx,snikch/sqlx,jmoiron/sqlx,aiyi/sqlx,outrightmental/go-sqlx,johnsto/sqlx,adcaes/sqlx,cortex/sqlx,proteneer/sqlx,StabbyCutyou/sqlx