Update src/content/docs/identityserver/reference/endpoints/introspection.md

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: RolandGuijt

src/content/docs/identityserver/reference/endpoints/introspection.md

@@ -80,6 +80,6 @@ var response = await client.IntrospectTokenAsync(new TokenIntrospectionRequest
     ClientId = "resource1",
     ClientSecret = "secret",
 
-    Token = dsf43534j33kkl..
+    Token = "<PLACEHOLDER_TOKEN>" // Replace with the actual token
 });
 ```