Minor documentation updates for new --cport option.

For #207.

src/iperf3.1

@@ -113,6 +113,10 @@ number of blocks (packets) to transmit (instead of -t or -n)
 .BR -l ", " --length " \fIn\fR[KM]"
 length of buffer to read or write (default 128 KB for TCP, 8KB for UDP)
 .TP
+.BR --cport " \fIport\fR"
+bind data streams to a specific client port (for TCP and UDP only,
+default is to use an ephemeral port)
+.TP
 .BR -P ", " --parallel " \fIn\fR"
 number of parallel client streams to run
 .TP

src/iperf_locale.c

@@ -108,7 +108,7 @@ const char usage_longstr[] = "Usage: iperf [-s|-c host] [options]\n"
                            "  -k, --blockcount #[KMG]   number of blocks (packets) to transmit (instead of -t or -n)\n"
                            "  -l, --len       #[KMG]    length of buffer to read or write\n"
 			   "                            (default %d KB for TCP, %d KB for UDP)\n"
-                           "  --cport         <port>    bind to a specific client port (default: ephemeral port)\n"
+                           "  --cport         <port>    bind to a specific client port (TCP and UDP, default: ephemeral port)\n"
                            "  -P, --parallel  #         number of parallel client streams to run\n"
                            "  -R, --reverse             run in reverse mode (server sends, client receives)\n"
                            "  -w, --window    #[KMG]    TCP window size (socket buffer size)\n"