Fix minor typo in documentation
Fix minor typo in documentation

The method name is `should_generate_new_friendly_id?` not `should_generate_new_friendly_id`.

That seems rather important. :-)

MatthewRDodds/friendly_id,joshsoftware/friendly_id,MAubreyK/friendly_id,ashagnanasekar/friendly_id,onursarikaya/friendly_id,ThanhKhoaIT/friendly_id,norman/friendly_id,morsedigital/friendly_id,Pathgather/friendly_id,kangkyu/friendly_id