Explain what sample application is, in no-dns.md (#5676)

* Explain what `sample application` is, in `no-dns.md`

* Update no-dns.md

docs/snippets/no-dns.md

@@ -1,6 +1,6 @@
 === "No DNS"
 
-    If you are using `curl` to access the sample applications, or your own Knative app, and are unable to use the "Magic DNS (sslip.io)" or "Real DNS" methods, there is a temporary approach. This is useful for those who wish to evaluate Knative without altering their DNS configuration, as per the "Real DNS" method, or cannot use the "Magic DNS" method due to using,
+    If you are using `curl` to access [the sample applications](/docs/getting-started/first-service/), or your own Knative app, and are unable to use the "Magic DNS (sslip.io)" or "Real DNS" methods, there is a temporary approach. This is useful for those who wish to evaluate Knative without altering their DNS configuration, as per the "Real DNS" method, or cannot use the "Magic DNS" method due to using,
     for example, minikube locally or IPv6 clusters.
 
     To access your application using `curl` using this method: