curl*3: added small examples

and some minor edits

docs/libcurl/curl_easy_init.3

@@ -44,5 +44,16 @@ this function.
 .SH RETURN VALUE
 If this function returns NULL, something went wrong and you cannot use the
 other curl functions.
+.SH EXAMPLE
+.nf
+CURL *curl = curl_easy_init();
+if(curl) {
+  CURLcode res;
+  curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
+  res = curl_easy_perform(curl);
+  curl_easy_cleanup(curl);
+}
+.fi
 .SH "SEE ALSO"
-.BR curl_easy_cleanup "(3), " curl_global_init "(3), " curl_easy_reset "(3)"
+.BR curl_easy_cleanup "(3), " curl_global_init "(3), " curl_easy_reset "(3), "
+.BR curl_easy_perform "(3) "