fio: remove deprecated --latency-log from manpage

The --latency-log argument is no longer accepted; fio returns
an error message saying it is deprecated.  So, remove it from
the manpage.

Signed-off-by: Robert Elliott <elliott@hp.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/fio.1 b/fio.1
index 89cbb82..fa2ac70 100644
--- a/fio.1
+++ b/fio.1
@@ -23,9 +23,6 @@
 .BI \-\-runtime \fR=\fPruntime
 Limit run time to \fIruntime\fR seconds.
 .TP
-.B \-\-latency\-log
-Generate per-job latency logs.
-.TP
 .B \-\-bandwidth\-log
 Generate per-job bandwidth logs.
 .TP