improve comment about falsy item

Co-authored-by: Andrey <Cjkjvfnby@gmail.com>

Author: isidroas

data_structures/hashing/hash_map.py

@@ -76,7 +76,7 @@ def _try_set(self, ind: int, key: KEY, val: VAL) -> bool:
         """
         stored = self._buckets[ind]
         if not stored:
-            # A falsy item means that is None (bucket never used) or _deleted.
+            # A falsy item means that bucket was never used (None) or was deleted (_deleted).
             self._buckets[ind] = _Item(key, val)
             self._len += 1
             return True