Update header docs to include Billing Agreement in BTPayPalAccountNonce
Update header docs to include Billing Agreement in BTPayPalAccountNonce

billCTG/braintree_ios,apascual/braintree_ios,apascual/braintree_ios,apascual/braintree_ios,billCTG/braintree_ios,braintree/braintree_ios,braintree/braintree_ios,braintree/braintree_ios,braintree/braintree_ios,billCTG/braintree_ios,apascual/braintree_ios,billCTG/braintree_ios,billCTG/braintree_ios