Clarifies disk-buffer support of drivers

content/headless/chunk/p-disk-buffer-drivers.md

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 <!-- DISCLAIMER: This file is based on the syslog-ng Open Source Edition documentation https://github.com/balabit/syslog-ng-ose-guides/commit/2f4a52ee61d1ea9ad27cb4f3168b95408fddfdf2 and is used under the terms of The syslog-ng Open Source Edition Documentation License. The file has been modified by Axoflow. -->
-The following destination drivers can use the disk-buffer option: `amqp()`, `elasticsearch2()`, `file()`, `hdfs()`, `http()`, `kafka()`, `mongodb()`, `program()`, `redis()`, `riemann()`, `smtp()`, `sql()`, `stomp()`, `unix-dgram()`, and `unix-stream()`. The `network()`, `syslog()`, `tcp()`, and `tcp6()` destination drivers can also use the disk-buffer option, except when using the `udp` transport method. (The other destinations or protocols do not provide the necessary feedback mechanisms required for the disk-buffer option.)
+Every destination driver supports the `disk-buffer()` option. The `network()`, `syslog()`, `tcp()`, and `tcp6()` destination drivers can also use the disk-buffer option, except when using the `udp` transport method.