curl_easy_ssls_export: make the example more clear

refs #18031

docs/libcurl/curl_easy_ssls_export.md

@@ -150,6 +150,12 @@ int main(void)
   if(curl) {
     curl_easy_setopt(curl, CURLOPT_SHARE, share);
 
+    /* run a transfer, all TLS sessions received will be added
+     * to the share. */
+    curl_easy_setopt(curl, CURLOPT_URL, "https://www.curl.se/");
+    curl_easy_perform(curl);
+
+    /* export the TLS sessions collected in the share */
     rc = curl_easy_ssls_export(curl, my_export_cb, NULL);
 
     /* always cleanup */