[docs] Fix doc for LogRecord.EventId attributes

Author: Lennart Kampshoff

src/OpenTelemetry.Exporter.OpenTelemetryProtocol/README.md

@@ -329,7 +329,7 @@ When set to `true`, it enables export of attributes corresponding to
 `exception.stacktrace` are defined in
 [specification](https://github.com/open-telemetry/semantic-conventions/blob/main/docs/exceptions/exceptions-logs.md#attributes).
 
-* `OTEL_DOTNET_EXPERIMENTAL_OTLP_EMIT_CATEGORY_EVENT_ATTRIBUTES`
+* `OTEL_DOTNET_EXPERIMENTAL_OTLP_EMIT_EVENT_LOG_ATTRIBUTES`
 
 When set to `true`, it enables export of `LogRecord.EventId.Id` as
 `logrecord.event.id` and `LogRecord.EventId.Name` to `logrecord.event.name`.