Clarify json/yaml support in changelog page
Clarify json/yaml support in changelog page

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