updated doc to latest changes

Author: Jan Rochel

doc/manual-wiki/libraries.wiki

@@ -46,7 +46,7 @@ Note that the ocsipersist-database under the specified name (default:
         password="Guess what I need!"
         database="ocsipersist" <!-- this is the default value if not specified -->
         unix_domain_socket_dir="./udsd"
-        hashtbl_size="16" <!-- rule of thumb: 8 * number of persistent values / tables -->
+        size_conn_pool="16" <!-- this is the default value; number of DB connections -->
       />
     </extension>
 }}}