Fix some typos. NFCI.

src/H5Fpkg.h

@@ -422,7 +422,7 @@ struct H5F_shared_t {
                                              * track changes in the index.
                                              * With one brief exception during
                                              * writer end of tick processing,
-                                             * this index will alwasy be sorted
+                                             * this index will always be sorted
                                              * in increasing HDF5 file page 
                                              * offset order.
                                              *

src/H5Fvfd_swmr.c

@@ -891,7 +891,7 @@ H5F_vfd_swmr_writer_end_of_tick(H5F_t *f)
      *    to the HDF5 file more than max_lag ticks ago, and haven't
      *    been modified since. 
      *
-     *    (This is an optimization -- adress it later)
+     *    (This is an optimization -- address it later)
      */