Update Log4j appender example to follow the spec #5443
Merged
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In https://github.com/open-telemetry/opentelemetry-specification/blob/v1.9.0/specification/logs/overview.md#trace-context-in-legacy-formats the spec defines how a Trace Context should be represented for logging in text formats:
I adapted the keys in the example provided in the Log4j appender readme to match that.