docs: Updated usage examples with project settings

Author: SolidAlloy

Samples~/Usage Examples.meta

@@ -57,7 +57,7 @@ private void SaveChanges(Action drawFields)
 
         private static void DrawInfoBoxIfAttributeFound(MemberInfo field)
         {
-            var infoBoxAttribute = (InfoBoxAttribute) Attribute.GetCustomAttribute(field, typeof(InfoBoxAttribute));
+            var infoBoxAttribute = field.GetCustomAttribute<InfoBoxAttribute>();
             if (infoBoxAttribute != null)
                 InfoBox.Draw(infoBoxAttribute.Text);
         }
@@ -71,8 +71,9 @@ private void DrawButtonsIfRequested()
 
             foreach (var method in methods)
             {
-                // Get the ButtonAttribute on the method (if any)
-                var ba = (ButtonAttribute) Attribute.GetCustomAttribute(method, typeof(ButtonAttribute));
+                DrawInfoBoxIfAttributeFound(method);
+
+                var ba = method.GetCustomAttribute<ButtonAttribute>();
 
                 if (ba == null)
                     continue;

Samples~/Usage Examples/Demo.unity

@@ -0,0 +1,17 @@
+namespace TypeReferences.Demo
+{
+    using UnityEditor;
+    using Utils;
+
+    public class ProjectSettings : TypeReferenceExample
+    {
+        [InfoBox("You can customize the look of the drop-down further in Project Settings. Hover over the setting label to find out what it means.")]
+        [Button]
+        public void GoToSettings()
+        {
+#if UNITY_EDITOR
+            SettingsService.OpenProjectSettings("Project/Type References");
+#endif
+        }
+    }
+}

Samples~/Usage Examples/Editor/TypeReferenceExampleEditor.cs

@@ -2,7 +2,7 @@
 {
     using System;
 
-    [AttributeUsage(AttributeTargets.Field)]
+    [AttributeUsage(AttributeTargets.Field | AttributeTargets.Method)]
     public class InfoBoxAttribute : Attribute
     {
         public string Text { get; }