chore: adapt core to preceding syntax change

src/Std/Data/DHashMap/Internal/Model.lean

@@ -12,7 +12,7 @@ public import all Std.Data.DHashMap.Internal.Defs
 public import Std.Data.DHashMap.Internal.HashesTo
 public import Std.Data.DHashMap.Internal.AssocList.Lemmas
 
-public @[expose] section
+@[expose] public section
 
 /-!
 This is an internal implementation file of the hash map. Users of the hash map should not rely on

src/Std/Internal/Rat.lean

@@ -12,7 +12,7 @@ public import Init.Data.Int.DivMod.Basic
 public import Init.Data.Int.Linear
 public import Init.Data.Nat.Gcd
 
-public @[expose] section
+@[expose] public section
 namespace Std
 namespace Internal
 

src/Std/Time/Internal/Bounded.lean

@@ -10,7 +10,7 @@ public import Init.Omega
 public import Init.Data.Int.DivMod.Lemmas
 public import Std.Classes.Ord.Basic
 
-public @[expose] section
+@[expose] public section
 
 namespace Std
 namespace Time

src/Std/Time/Internal/UnitVal.lean

@@ -9,7 +9,7 @@ prelude
 public import Std.Classes.Ord.Basic
 public import Std.Internal.Rat
 
-public @[expose] section
+@[expose] public section
 
 namespace Std
 namespace Time

src/Std/Time/Time/Unit/Second.lean

@@ -9,7 +9,7 @@ prelude
 public import Std.Internal.Rat
 public import Std.Time.Time.Unit.Nanosecond
 
-public @[expose] section
+@[expose] public section
 
 namespace Std
 namespace Time