Fix typo

Author: stephentoub

src/Libraries/Microsoft.Extensions.AI.OpenAI/OpenAIChatClient.cs

@@ -160,7 +160,7 @@ internal static ChatTool ToOpenAIChatTool(AIFunctionDeclaration aiFunction, Chat
                 input.Role == OpenAIClientExtensions.ChatRoleDeveloper)
             {
                 var parts = ToOpenAIChatContent(input.Contents);
-                string? name = SantizeAuthorName(input.AuthorName);
+                string? name = SanitizeAuthorName(input.AuthorName);
                 yield return
                     input.Role == ChatRole.System ? new SystemChatMessage(parts) { ParticipantName = name } :
                     input.Role == OpenAIClientExtensions.ChatRoleDeveloper ? new DeveloperChatMessage(parts) { ParticipantName = name } :
@@ -237,7 +237,7 @@ internal static ChatTool ToOpenAIChatTool(AIFunctionDeclaration aiFunction, Chat
                         new(ChatMessageContentPart.CreateTextPart(string.Empty));
                 }
 
-                message.ParticipantName = SantizeAuthorName(input.AuthorName);
+                message.ParticipantName = SanitizeAuthorName(input.AuthorName);
                 message.Refusal = refusal;
 
                 yield return message;
@@ -758,7 +758,7 @@ internal static void ConvertContentParts(ChatMessageContent content, IList<AICon
         };
 
     /// <summary>Sanitizes the author name to be appropriate for including as an OpenAI participant name.</summary>
-    private static string? SantizeAuthorName(string? name)
+    private static string? SanitizeAuthorName(string? name)
     {
         if (name is not null)
         {