Updated documentation for Analytics.locationEnabled
Updated documentation for Analytics.locationEnabled

We are changing the way location is gathered, so it will no longer be needed when the app is in background

ibm-bluemix-mobile-services/bms-clientsdk-swift-analytics-api,ibm-bluemix-mobile-services/bms-clientsdk-swift-analytics-api,ibm-bluemix-mobile-services/bms-clientsdk-swift-analytics-api