Fix typo in iperf3.1

src/iperf3.1

@@ -96,7 +96,7 @@ test by specifying the --get-server-output flag.
 Either the client or the server can produce its output in a JSON
 structure, useful for integration with other programs, by passing it
 the -J flag.
-Normally the contents of the JSON structure are only competely known
+Normally the contents of the JSON structure are only completely known
 after the test has finished, no JSON output will be emitted until the
 end of the test.
 By enabling line-delimited JSON multiple objects will be emitted to