Update quickstart-csharp.md

Fixed typo in comments and simplified comments too

Author: RobiladK

articles/ai-services/agents/includes/quickstart-csharp.md

@@ -99,7 +99,7 @@ ThreadRun run = client.Runs.CreateRun(
     agent.Id,
     additionalInstructions: "Please address the user as Jane Doe. The user has a premium account.");
 
-//Pool for the completion of the ThreadRun.
+//Poll for completion.
 do
 {
     Thread.Sleep(TimeSpan.FromMilliseconds(500));
@@ -114,7 +114,7 @@ Pageable<ThreadMessage> messages = client.Messages.GetMessages(
     threadId: thread.Id,
     order: ListSortOrder.Ascending);
 
-//Display each message and open the image generated by Agent using CodeInterpreterToolDefinition.
+//Display each message and open the image generated using CodeInterpreterToolDefinition.
 foreach (ThreadMessage threadMessage in messages)
 {
     foreach (MessageContent content in threadMessage.ContentItems)