importing_data.md: Add location trash example

Author: adriendupuis

code_samples/data_migration/examples/trash_location.yaml

@@ -0,0 +1,12 @@
+-
+    type: location
+    mode: trash
+    match:
+        field: location_remote_id
+        value: f3e90596361e31d496d4026eb624c983
+-
+    type: location
+    mode: trash
+    match:
+        field: location_id
+        value: 5

docs/content_management/data_migration/importing_data.md

@@ -306,6 +306,12 @@ The following example shows how to swap content items assigned to given location
 
 The metadata keys for Location are optional.
 
+The following example shows how to trash locations.
+
+``` yaml
+[[= include_file('code_samples/data_migration/examples/trash_location.yaml') =]]
+```
+
 ### Users
 
 The following example shows how to create a user.