Remove 'Sse' from AspNetCoreSseServer sample name (#665)

samples/AspNetCoreMcpServer/Tools/EchoTool.cs

@@ -0,0 +1,14 @@
+using ModelContextProtocol.Server;
+using System.ComponentModel;
+
+namespace AspNetCoreMcpServer.Tools;
+
+[McpServerToolType]
+public sealed class EchoTool
+{
+    [McpServerTool, Description("Echoes the input back to the client.")]
+    public static string Echo(string message)
+    {
+        return "hello " + message;
+    }
+}