CURLOPT_READFUNCTION.3: see also CURLOPT_UPLOAD_BUFFERSIZE [ci skip]

Reported-by: Roy Bellingan
Bug: #3885

docs/libcurl/opts/CURLOPT_READFUNCTION.3

@@ -5,7 +5,7 @@
 .\" *                            | (__| |_| |  _ <| |___
 .\" *                             \___|\___/|_| \_\_____|
 .\" *
-.\" * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
 .\" *
 .\" * This software is licensed as described in the file COPYING, which
 .\" * you should have received as part of this distribution. The terms
@@ -79,3 +79,4 @@ This will return CURLE_OK.
 .SH "SEE ALSO"
 .BR CURLOPT_READDATA "(3), " CURLOPT_WRITEFUNCTION "(3), "
 .BR CURLOPT_SEEKFUNCTION "(3), " CURLOPT_UPLOAD "(3), " CURLOPT_POST "(3), "
+.BR CURLOPT_UPLOAD_BUFFERSIZE "(3), "