typos in ephemeron-related comments

runtime/caml/weak.h

@@ -36,13 +36,13 @@ struct caml_ephe_info {
   value todo;
   /* These are ephemerons which need to be marked and swept in the current
      cycle. If the ephemeron is alive, after marking, they go into the live
-     list after cleaning them off the unreachable keys and releasing the data
+     list after cleaning off the unreachable keys and releasing the data
      if any of the keys are unreachable. */
 
   value live;
-  /* These are ephemerons are alive (marked). The keys of these ephemerons may
-     be unmarked if these ephemerons were the target of a blit operation. The
-     data field is never unmarked. */
+  /* These are ephemerons which are alive (marked). The keys of these ephemerons
+     may be unmarked if these ephemerons were the target of a blit operation.
+     The data field is never unmarked. */
 
   int must_sweep_ephe;
   /* At the beginning of [Phase_sweep_ephe] the [live] list is moved to the

runtime/weak.c

@@ -74,7 +74,7 @@ CAMLprim value caml_weak_create (value len)
    Specificity of the cleaning phase (Phase_clean):
 
    The dead keys must be removed from the ephemerons and data removed
-   when one the keys is dead. Here we call it cleaning the ephemerons.
+   when one of the keys is dead. Here we call it cleaning the ephemerons.
    A specific phase of the GC is dedicated to this, Phase_clean. This
    phase is just after the mark phase, so the white values are dead
    values. It iterates the function caml_ephe_clean through all the