curl_share_setopt.3: improve wording [ci ship]

.\" *                            | (__| |_| |  _ <| |___

.\" *                             \___|\___/|_| \_\_____|

.\" *

.\" * Copyright (C) 1998 - 2018, 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

void lock_function(CURL *handle, curl_lock_data data, curl_lock_access access,

void *userptr);

\fIdata\fP defines what data libcurl wants to lock, and you must make sure that

only one lock is given at any time for each kind of data.

The \fIdata\fP argument tells what kind of data libcurl wants to lock. Make

sure that the callback uses a different lock for each kind of data.

\fIaccess\fP defines what access type libcurl wants, shared or single.