storage_driver: fix a comment typo

s/rereshed/refreshed
Signed-off-by: NChen Hanxiao <chenhanxiao@cn.fujitsu.com>

src/storage/storage_driver.c

@@ -1998,7 +1998,7 @@ virStorageVolPoolRefreshThread(void *opaque)
  * to perform a pool refresh.
  *
  * @st Pointer to stream being closed.
- * @opaque Buffer to hold the pool name to be rereshed
+ * @opaque Buffer to hold the pool name to be refreshed
  */
 static void
 virStorageVolFDStreamCloseCb(virStreamPtr st ATTRIBUTE_UNUSED,