Update OpenSearch-dot-net.md (#6690)

Signed-off-by: kolchfa-aws <105444904+kolchfa-aws@users.noreply.github.com>

_clients/OpenSearch-dot-net.md

@@ -400,7 +400,7 @@ internal class Program
             FirstName = "Paulo", 
             LastName = "Santos", 
             Gpa = 3.93, 
-            GradYear = 2021 };v
+            GradYear = 2021 };
         var response = client.Index<StringResponse>("students", "100",  
                                         PostData.Serializable(student));
         Console.WriteLine(response.Body);