Correct link in section 7.9.4

Correct the link in section 7.9.4. Configuring the transactions subsystem to use the JDBC storage for transaction log
it should be https://access.redhat.com/documentation/en-us/red_hat_jboss_enterprise_application_platform/7.3/html-single/managing_transactions_on_jboss_eap/index#transactions_object_store

Not 
https://access.redhat.com/documentation/en-us/red_hat_fuse/7.0/html/transaction_guide/using-jdbc-data-sources#configuring-jdbc-data-sources