docs: add missing xml comments

src/AnthropicClient/Models/JsonDelta.cs

@@ -2,8 +2,14 @@ using System.Text.Json.Serialization;
 
 namespace AnthropicClient.Models;
 
+/// <summary>
+/// Represents a JSON delta.
+/// </summary>
 public class JsonDelta : ContentDelta
 {
+  /// <summary>
+  /// Gets the partial JSON.
+  /// </summary>
   [JsonPropertyName("partial_json")]
   public string PartialJson { get; init; } = string.Empty;
 
@@ -12,6 +18,11 @@ public class JsonDelta : ContentDelta
   {
   }
 
+  /// <summary>
+  /// Initializes a new instance of the <see cref="JsonDelta"/> class.
+  /// </summary>
+  /// <param name="partialJson">The partial JSON.</param>
+  /// <returns>A new instance of the <see cref="JsonDelta"/> class.</returns>
   public JsonDelta(string partialJson) : base(ContentDeltaType.JsonDelta)
   {
     PartialJson = partialJson;