Fix keyed sample

dodyg · dodyg · commit 494c5cc1a0cd · 2023-09-13T14:37:58.000+03:00
diff --git a/projects/.net8/keyed-service/Program.cs b/projects/.net8/keyed-service/Program.cs
@@ -23,10 +23,10 @@ string GetServiceKey()
     var key = GetServiceKey();
     var greeting = provider.GetRequiredKeyedService<IGreeting>(key);
 
-    return Results.Content("""
+    return Results.Content($$"""
     <html>
     <body>
-        {{ greeting.Message }}}
+        {{ greeting.Message }}
     </body>
     </html>
     """, "text/html");
