io: remove mention on source file about flush mode
*
* Note that Upstreams context may define how network operations will work,
* basically synchronous or asynchronous (non-blocking).
- *
- * When Fluent Bit is set with config->flush_mode = FLB_FLUSH_PTHREADS, all
- * operations will work in blocking (synchronous) mode.
*/
#include <stdio.h>
