changed some font sizes, added highlights for some iOS code samples and change some indents
changed some font sizes, added highlights for some iOS code samples and change some indents

Wizcorp/phonegap-plugin-wizPurchase,claydotio/phonegap-plugin-wizPurchase,claydotio/phonegap-plugin-wizPurchase,Wizcorp/cordova-plugin-wizpurchase,Wizcorp/phonegap-plugin-wizPurchase,claydotio/phonegap-plugin-wizPurchase,Wizcorp/cordova-plugin-wizpurchase,Wizcorp/phonegap-plugin-wizPurchase,claydotio/phonegap-plugin-wizPurchase,Wizcorp/phonegap-plugin-wizPurchase,jrouault/cordova-plugin-wizpurchase,Wizcorp/phonegap-plugin-wizPurchase,jrouault/cordova-plugin-wizpurchase,claydotio/phonegap-plugin-wizPurchase