CB-11936 - Add docs for the four new App Transport Security (ATS) keys
CB-11936 - Add docs for the four new App Transport Security (ATS) keys

 This closes #648

stevengill/cordova-docs,apache/cordova-docs,purplecabbage/cordova-docs,apache/cordova-docs,apache/cordova-docs,purplecabbage/cordova-docs,shazron/cordova-docs,tony--/cordova-docs,purplecabbage/cordova-docs,tony--/cordova-docs,tony--/cordova-docs,stevengill/cordova-docs,purplecabbage/cordova-docs,shazron/cordova-docs,stevengill/cordova-docs,stevengill/cordova-docs,shazron/cordova-docs,shazron/cordova-docs,apache/cordova-docs