fix: java pojo api error code example (#6329)

Author: fffguo

src/writeData/clients/Java/write.2.example

@@ -4,7 +4,7 @@ mem.used_percent = 23.43234543;
 mem.time = Instant.now();
 
 WriteApiBlocking writeApi = client.getWriteApiBlocking();
-writeApi.writeRecord(bucket, org, WritePrecision.NS, mem);
+writeApi.writeMeasurement(bucket, org, WritePrecision.NS, mem);