Fix typos in the description of Server
diff --git a/src/csharp/Grpc.Core/Server.cs b/src/csharp/Grpc.Core/Server.cs
index 60dacbf..64bb407 100644
--- a/src/csharp/Grpc.Core/Server.cs
+++ b/src/csharp/Grpc.Core/Server.cs
@@ -29,7 +29,7 @@
 namespace Grpc.Core
 {
     /// <summary>
-    /// gRPC server. A single server can server arbitrary number of services and can listen on more than one ports.
+    /// gRPC server. A single server can serve an arbitrary number of services and can listen on more than one port.
     /// </summary>
     public class Server
     {