improve module docs

src/modules/module-jack-tunnel.c

@@ -36,7 +36,7 @@
  * The jack-tunnel module provides a source or sink that tunnels all audio to
  * a JACK server.
  *
- * This module is usually used together with module-jack-dbus that will
+ * This module is usually used together with \ref page_module_jackdbus_detect that will
  * automatically load the tunnel with the right parameters based on dbus
  * information.
  *
@@ -102,6 +102,7 @@ PW_LOG_TOPIC_STATIC(mod_topic, "mod." NAME);
 #define DEFAULT_POSITION	"[ FL FR ]"
 
 #define MODULE_USAGE	"( remote.name=<remote> ] "				\
+			"( jack.library=<jack library path> ) "			\
 			"( jack.server=<server name> ) "			\
 			"( jack.client-name=<name of the JACK client> ] "	\
 			"( jack.connect=<bool, autoconnect ports> ] "		\

src/modules/module-jackdbus-detect.c

@@ -33,11 +33,7 @@
  * ## Module Options
  *
  * There are no module-specific options, all arguments are passed to
- * \page page_module_jack_tunnel.
+ * \ref page_module_jack_tunnel.
- *
- * ## General options
- *
- * There are no general options for this module.
  *
  * ## Example configuration
  *\code{.unparsed}