chore(CategoryTheory): move file about abelian sheaf categories to co…

…rrect location (#12216)

Mathlib.lean

@@ -1461,6 +1461,7 @@ import Mathlib.CategoryTheory.Shift.ShiftSequence
 import Mathlib.CategoryTheory.Sigma.Basic
 import Mathlib.CategoryTheory.Simple
 import Mathlib.CategoryTheory.SingleObj
+import Mathlib.CategoryTheory.Sites.Abelian
 import Mathlib.CategoryTheory.Sites.Adjunction
 import Mathlib.CategoryTheory.Sites.Canonical
 import Mathlib.CategoryTheory.Sites.Closed
@@ -4065,7 +4066,6 @@ import Mathlib.Topology.Sets.Closeds
 import Mathlib.Topology.Sets.Compacts
 import Mathlib.Topology.Sets.Opens
 import Mathlib.Topology.Sets.Order
-import Mathlib.Topology.Sheaves.Abelian
 import Mathlib.Topology.Sheaves.Forget
 import Mathlib.Topology.Sheaves.Functors
 import Mathlib.Topology.Sheaves.Init

Mathlib/Topology/Sheaves/Abelian.lean → Mathlib/CategoryTheory/Sites/Abelian.lean

@@ -18,8 +18,6 @@ sheafification is possible in `C`, `Sheaf J D` is abelian as well (`sheafIsAbeli
 
 Hence, `presheafToSheaf` is an additive functor (`presheafToSheaf_additive`).
 
-TODO: This file should be moved to `CategoryTheory/Sites`.
-
 -/
 
 

Mathlib/Condensed/Abelian.lean

@@ -3,9 +3,9 @@ Copyright (c) 2023 Adam Topaz. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Adam Topaz
 -/
-import Mathlib.Topology.Sheaves.Abelian
 import Mathlib.Algebra.Category.GroupCat.Abelian
 import Mathlib.Algebra.Category.GroupCat.FilteredColimits
+import Mathlib.CategoryTheory.Sites.Abelian
 import Mathlib.Condensed.Basic
 
 /-!