Fix imports

Author: wkrozowski

src/Std/Data/DTreeMap.lean

@@ -9,3 +9,5 @@ prelude
 public import Std.Data.DTreeMap.Basic
 public import Std.Data.DTreeMap.AdditionalOperations
 public import Std.Data.DTreeMap.Lemmas
+public import Std.Data.DTreeMap.Iterator
+public import Std.Data.DTreeMap.Slice

src/Std/Data/DTreeMap/Raw/Iterator.lean

@@ -7,7 +7,7 @@ module
 
 prelude
 public import Std.Data.DTreeMap.Internal.Zipper
-public import Std.Data.DTreeMap
+public import Std.Data.DTreeMap.Raw.Basic
 
 /-!
 # Iterators on `DTreeMap.Raw`