Improve accuracy of accepted parameter types in phpDoc of Database->fetch
Improve accuracy of accepted parameter types in phpDoc of Database->fetch

- Suppresses an unwarranted type error raised by static analyzers

tobiasd/friendica,annando/friendica,friendica/friendica,friendica/friendica,annando/friendica,tobiasd/friendica,annando/friendica,friendica/friendica,tobiasd/friendica,annando/friendica,annando/friendica,tobiasd/friendica,friendica/friendica,tobiasd/friendica,friendica/friendica