Fix an issue with the Google Maps service tutorial
Fix an issue with the Google Maps service tutorial

Name collision between 2 variables in `pinLocation()` produced `gmaps.js:32 InvalidValueError: setTitle: not a string`.
davidpett/guides,ubuntuvim/guides,bmac/guides,HeroicEric/guides,nicobot/guides,nicobot/guides,MarkMT/guides,MarkMT/guides,MarkMT/guides,knownasilya/guides,knownasilya/guides,ubuntuvim/guides,jkarsrud/guides,davidpett/guides,skaterdav85/guides,tleskin/guides,ubuntuvim/guides,davidpett/guides,bmac/guides,tleskin/guides,davidpett/guides,knownasilya/guides,bmac/guides,bmac/guides,MarkMT/guides,nicobot/guides,ubuntuvim/guides,skaterdav85/guides,jkarsrud/guides,skaterdav85/guides,jkarsrud/guides,knownasilya/guides,HeroicEric/guides,skaterdav85/guides,HeroicEric/guides,jkarsrud/guides,tleskin/guides