fix comment formatting for "concurrent" cache in *ha.xml profiles

            <cache-container name="web" default-cache="dist" module="org.wildfly.clustering.web.infinispan">
...
                <!-- Alternate configuration to reduce lock contention for applications that make use of concurrent access to a web session -->
                <!-- Web sessions will be locked more frequently, but for shorter periods of time -->
                <!--
                  ~ distributed-cache name="concurrent">
                  ~                     <file-store/>
                  ~                 </distributed-cache
                  -->
            </cache-container>

            <cache-container name="web" default-cache="dist" module="org.wildfly.clustering.web.infinispan">
...
                <!-- Alternate configuration to reduce lock contention for applications that make use of concurrent access to a web session -->
                <!-- Web sessions will be locked more frequently, but for shorter periods of time -->       
                <!-- 
                <distributed-cache name="concurrent">
                    <file-store/>
                </distributed-cache>
                -->
            </cache-container>