fix some comments

Author: methane

Objects/dictnotes.txt

@@ -70,8 +70,8 @@ A values array
 Tunable Dictionary Parameters
 -----------------------------
 
-See comments for PyDict_MINSIZE_SPLIT, PyDict_MINSIZE_COMBINED,
-USABLE_FRACTION and GROWTH_RATE in dictobject.c
+See comments for PyDict_MINSIZE, USABLE_FRACTION and GROWTH_RATE in
+dictobject.c
 
 Tune-ups should be measured across a broad range of applications and
 use cases.  A change to any parameter will help in some situations and

Objects/dictobject.c

@@ -40,8 +40,8 @@ Size of indices is dk_size.  Type of each index in indices is vary on dk_size:
 * int32 for 2**16 <= dk_size <= 2**31
 * int64 for 2**32 <= dk_size
 
-dk_entries is array of PyDictKeyEntry.  Its size is USABLE_FRACTION(dk_size).
-DK_ENTRIES(dk) can be used to get pointer to entries.
+dk_entries is array of PyDictKeyEntry when dk_kind == DICT_KEYS_GENERAL or
+PyDictUnicodeEntry otherwise. Its length is USABLE_FRACTION(dk_size).
 
 NOTE: Since negative value is used for DKIX_EMPTY and DKIX_DUMMY, type of
 dk_indices entry is signed integer and int16 is used for table which