fix: address copilot comments

src/AnthropicClient/Json/CitationConverter.cs

@@ -17,7 +17,7 @@ class CitationConverter : JsonConverter<Citation>
       CitationType.CharacterLocation => JsonSerializer.Deserialize<CharacterLocationCitation>(root.GetRawText(), options)!,
       CitationType.PageLocation => JsonSerializer.Deserialize<PageLocationCitation>(root.GetRawText(), options)!,
       CitationType.ContentBlockLocation => JsonSerializer.Deserialize<ContentBlockLocationCitation>(root.GetRawText(), options)!,
-      _ => throw new JsonException($"Unknown content type: {type}")
+      _ => throw new JsonException($"Unknown citation type: {type}")
     };
   }
 

src/AnthropicClient/Json/SourceConverter.cs

@@ -17,7 +17,7 @@ class SourceConverter : JsonConverter<Source>
       SourceType.Text => JsonSerializer.Deserialize<TextSource>(root.GetRawText(), options)!,
       SourceType.Content => JsonSerializer.Deserialize<CustomSource>(root.GetRawText(), options)!,
       SourceType.Base64 => DeserializeBase64Source(root, options),
-      _ => throw new JsonException($"Unknown content type: {type}")
+      _ => throw new JsonException($"Unknown source type: {type}")
     };
   }
 

src/AnthropicClient/Models/Base64Source.cs

@@ -5,7 +5,7 @@ using AnthropicClient.Utils;
 namespace AnthropicClient.Models;
 
 /// <summary>
-/// Represents an base64 source.
+/// Represents a base64 source.
 /// </summary>
 public class Base64Source : Source
 {

src/AnthropicClient/Models/ContentBlockLocationCitation.cs

@@ -9,7 +9,7 @@ public class ContentBlockLocationCitation : Citation
 {
   /// <summary>
   /// Gets the start block index of the citation.
-  /// /// </summary>
+  /// </summary>
   [JsonPropertyName("start_block_index")]
   public int StartBlockIndex { get; init; }