[COOK-3552] Not necessarily wrong, but somehow misleading.

http://tickets.opscode.com/browse/COOK-3552

Technically there is nothing wrong with this statement since 
node['postgresql']['config']['listen_address'] = 'localhost' 
will literally write
listen_address = 'localhost'
in the postgresql.conf file, that being said it is slightly misleading since the correct value is "listen_addresses" and not "listen_address", so somebody copy/pastying could get erroneous data.