async logging manual  page: added disclaimer about async logging when CPU resources are scarce
async logging manual  page: added disclaimer about async logging when CPU resources are scarce

codescale/logging-log4j2,lqbweb/logging-log4j2,GFriedrich/logging-log4j2,lqbweb/logging-log4j2,xnslong/logging-log4j2,xnslong/logging-log4j2,apache/logging-log4j2,GFriedrich/logging-log4j2,xnslong/logging-log4j2,GFriedrich/logging-log4j2,apache/logging-log4j2,codescale/logging-log4j2,codescale/logging-log4j2,lqbweb/logging-log4j2,apache/logging-log4j2