man/io_uring_prep_write.3: correct passed in buffer argument
man/io_uring_prep_write.3: correct passed in buffer argument

It's a write, the buffer argument is const.

Signed-off-by: Jens Axboe <cd8c6775e60d6f67a6984377324e5290df3d5358@kernel.dk>

axboe/liburing,axboe/liburing,axboe/liburing