Fix typo in 2nd example
Fix typo in 2nd example

itxd/angularfire,bpietravalle/angularfire,fbentz/angularfire,nbr1ninrsan2/angularfire,douglascorrea/angularfire,fbentz/angularfire,bpietravalle/angularfire,cesarmarinhorj/angularfire,bpietravalle/angularfire,FirebaseExtended/angularfire,denisKaranja/angularfire,nbr1ninrsan2/angularfire,cesarmarinhorj/angularfire,itxd/angularfire,yoda-yoda/angularfire,yoda-yoda/angularfire,yoda-yoda/angularfire,nbr1ninrsan2/angularfire,FirebaseExtended/angularfire,FirebaseExtended/angularfire,denisKaranja/angularfire,jamestalmage/angularfire,cesarmarinhorj/angularfire,jamestalmage/angularfire,douglascorrea/angularfire,denisKaranja/angularfire,fbentz/angularfire,jamestalmage/angularfire,itxd/angularfire,douglascorrea/angularfire