dispatch_cfg_st.h: make comments into doxygen.

struct smartlist_t;

/* Information needed to create a dispatcher, but in a less efficient, more

 * mutable format. */

/** Information needed to create a dispatcher, but in a less efficient, more

 * mutable format.

 *

 * Nearly everybody should use the \refdir{lib/pubsub} module to configure

 * dispatchers, instead of using this. */

struct dispatch_cfg_t {

  /** A list of msg_type_id_t (cast to void*), indexed by msg_t. */

  struct smartlist_t *type_by_msg;