Correcting a typo in the set property documentation.
Correcting a typo in the set property documentation.

The longitude attribute (:longitude_attr) was incorrectly
identified as :longitude. Also set the statement across
two separate lines for readability.

fxposter/thinking-sphinx,factorylabs/thinking-sphinx,Napolskih/thinking-sphinx,yob/thinking-sphinx,agibralter/thinking-sphinx,dhh/thinking-sphinx,talho/thinking-sphinx,leei/thinking-sphinx,raecoo/thinking-sphinx-chinese,pierrevalade/thinking-sphinx,Dishwasha/thinking-sphinx