Update Log4j appender example to follow the spec
MODIFY
instrumentation/log4j/log4j-appender-2.16/library/README.md
instrumentation/log4j/log4j-appender-2.16/library/README.md
@@ -38,7 +38,7 @@ The following demonstrates how you might configure the appender in your `log4j.x
<Appenders>
<Console name="Console" target="SYSTEM_OUT">
<PatternLayout
- pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} traceId: %X{trace_id} spanId: %X{span_id} flags: %X{trace_flags} - %msg%n"/>
+ pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} trace_id: %X{trace_id} span_id: %X{span_id} trace_flags: %X{trace_flags} - %msg%n"/>
</Console>
<OpenTelemetry name="OpenTelemetryAppender"/>
</Appenders>

Update Log4j appender example to follow the spec (#5443)