Fix namespace syntax

Author: bergmania

src/Umbraco.Core/Models/ContentEditing/HistoryCleanup.cs

@@ -1,16 +1,18 @@
 using System.Runtime.Serialization;
 
-namespace Umbraco.Core.Models.ContentEditing;
-
-[DataContract(Name = "historyCleanup", Namespace = "")]
-public class HistoryCleanup
+namespace Umbraco.Core.Models.ContentEditing
 {
-    [DataMember(Name = "preventCleanup")]
-    public bool PreventCleanup { get; set; }
+    [DataContract(Name = "historyCleanup", Namespace = "")]
+    public class HistoryCleanup
+    {
+        [DataMember(Name = "preventCleanup")]
+        public bool PreventCleanup { get; set; }
 
-    [DataMember(Name = "keepAllVersionsNewerThanDays")]
-    public int? KeepAllVersionsNewerThanDays { get;set; }
+        [DataMember(Name = "keepAllVersionsNewerThanDays")]
+        public int? KeepAllVersionsNewerThanDays { get;set; }
 
-    [DataMember(Name = "keepLatestVersionPerDayForDays")]
-    public int? KeepLatestVersionPerDayForDays { get;set; }
+        [DataMember(Name = "keepLatestVersionPerDayForDays")]
+        public int? KeepLatestVersionPerDayForDays { get;set; }
+    }
 }
+