Add some comments

event/hloop.h

@@ -536,7 +536,7 @@ typedef struct unpack_setting_s {
  *
  * NOTE: unpack_setting_t of multiple IOs of the same function also are same,
  *       so only the pointer of unpack_setting_t is stored in hio_t,
- *       the life time and of unpack_setting_t shoud be guaranteed by caller.
+ *       the life time of unpack_setting_t shoud be guaranteed by caller.
  */
 HV_EXPORT void hio_set_unpack(hio_t* io, unpack_setting_t* setting);
 HV_EXPORT void hio_unset_unpack(hio_t* io);

evpp/Channel.h

@@ -295,7 +295,7 @@ public:
      *
      * NOTE: unpack_setting_t of multiple IOs of the same function also are same,
      *       so only the pointer of unpack_setting_t is stored in hio_t,
-     *       the life time and of unpack_setting_t shoud be guaranteed by caller.
+     *       the life time of unpack_setting_t shoud be guaranteed by caller.
      */
     void setUnpack(unpack_setting_t* setting) {
         if (io_ == NULL) return;