[DOCS] Adds a link to the Quick Start section that points to an EC ingest example (#1546)

Author: szabosteve

docs/introduction.asciidoc

@@ -133,6 +133,9 @@ async function run () {
 run().catch(console.log)
 ----
 
+TIP: For an elaborate example of how to ingest data into Elastic Cloud, 
+refer to {cloud}/ec-getting-started-node-js.html[this page].
+
 [discrete]
 ==== Install multiple versions