Add linter support to StackPrototype, fix linter errors.

Content.Shared/Stacks/StackPrototype.cs

@@ -1,5 +1,6 @@
 using Robust.Shared.Prototypes;
 using Robust.Shared.Serialization.Manager.Attributes;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype;
 using Robust.Shared.Utility;
 using Robust.Shared.ViewVariables;
 
@@ -12,16 +13,23 @@ namespace Content.Shared.Stacks
         [DataField("id", required: true)]
         public string ID { get; } = default!;
 
+        /// <summary>
+        ///     Human-readable name for this stack type e.g. "Steel"
+        /// </summary>
+        /// <remarks>This is a localization string ID.</remarks>
         [DataField("name")]
         public string Name { get; } = string.Empty;
 
+        /// <summary>
+        ///     An icon that will be used to represent this stack type.
+        /// </summary>
         [DataField("icon")]
         public SpriteSpecifier? Icon { get; } = null;
 
         /// <summary>
         ///     The entity id that will be spawned by default from this stack.
         /// </summary>
-        [DataField("spawn", required: true)]
+        [DataField("spawn", required: true, customTypeSerializer:typeof(PrototypeIdSerializer<EntityPrototype>))]
         public string Spawn { get; } = string.Empty;
     }
 }