fix wrong spells in slave_connection.go
fix wrong spells in slave_connection.go

Signed-off-by: czm <95e483674d6aaddca68d52cac2554f8971532662@daocloud.io>

tinyspeck/vitess,mahak/vitess,vitessio/vitess,mahak/vitess,mahak/vitess,mahak/vitess,tinyspeck/vitess,vitessio/vitess,vitessio/vitess,tinyspeck/vitess,vitessio/vitess,vitessio/vitess,mahak/vitess,mahak/vitess,tinyspeck/vitess,mahak/vitess,tinyspeck/vitess,vitessio/vitess,tinyspeck/vitess,tinyspeck/vitess,vitessio/vitess,mahak/vitess,vitessio/vitess