Add missing OpenAI APIs to missingapi.yml file (#11578)

Author: Copilot

_zip/missingapi.yml

@@ -35,6 +35,10 @@ references:
   name: AssistantClient
   fullname: OpenAI.Assistants.AssistantClient
   href: https://github.com/openai/openai-dotnet/blob/main/api/OpenAI.netstandard2.0.cs
+- uid: OpenAI.Assistants.FunctionToolDefinition
+  name: FunctionToolDefinition
+  fullname: OpenAI.Assistants.FunctionToolDefinition
+  href: https://github.com/openai/openai-dotnet/blob/main/api/OpenAI.netstandard2.0.cs
 - uid: OpenAI.Audio.AudioClient
   name: AudioClient
   fullname: OpenAI.Audio.AudioClient
@@ -43,6 +47,10 @@ references:
   name: ChatClient
   fullname: OpenAI.Chat.ChatClient
   href: https://github.com/openai/openai-dotnet/blob/main/api/OpenAI.netstandard2.0.cs
+- uid: OpenAI.Chat.ChatTool
+  name: ChatTool
+  fullname: OpenAI.Chat.ChatTool
+  href: https://github.com/openai/openai-dotnet/blob/main/api/OpenAI.netstandard2.0.cs
 - uid: OpenAI.Embeddings.EmbeddingClient
   name: EmbeddingClient
   fullname: OpenAI.Embeddings.EmbeddingClient
@@ -51,6 +59,10 @@ references:
   name: OpenAIClient
   fullname: OpenAI.OpenAIClient
   href: https://github.com/openai/openai-dotnet/blob/main/api/OpenAI.netstandard2.0.cs
+- uid: OpenAI.Realtime.ConversationFunctionTool
+  name: ConversationFunctionTool
+  fullname: OpenAI.Realtime.ConversationFunctionTool
+  href: https://github.com/openai/openai-dotnet/blob/main/api/OpenAI.netstandard2.0.cs
 - uid: OpenAI.RealtimeConversation.ConversationFunctionTool
   name: ConversationFunctionTool
   fullname: OpenAI.RealtimeConversation.ConversationFunctionTool
@@ -71,6 +83,10 @@ references:
   name: OpenAIResponseClient
   fullname: OpenAI.Responses.OpenAIResponseClient
   href: https://github.com/openai/openai-dotnet/blob/main/api/OpenAI.netstandard2.0.cs
+- uid: OpenAI.Responses.ResponseTool
+  name: ResponseTool
+  fullname: OpenAI.Responses.ResponseTool
+  href: https://github.com/openai/openai-dotnet/blob/main/api/OpenAI.netstandard2.0.cs
 - uid: Polly.CircuitBreaker.CircuitBreakerStrategyOptions`1
   name: CircuitBreakerStrategyOptions`1
   fullname: Polly.CircuitBreaker.CircuitBreakerStrategyOptions`1