[7.2] Configuration Guide: Correct "replicated" and "distributed" mode references

In the 7.2 GA Configuration Guide:
https://access.redhat.com/documentation/en-us/red_hat_jboss_enterprise_application_platform/7.2/html-single/configuration_guide/index#clustering_modes
there is reference to "distributed mode" and "replicated mode." These need to be changed to "distribution mode" and "replication mode" to align with the usage in the rest of the documentation.