Fix code samples link (#1076)

The link to code samples refers to IMDG (suggests outdated) and no longer works, redirecting to the hazelcast homepage - updated with a link to the active `code-samples` repo.

docs/modules/getting-started/pages/resources.adoc

@@ -4,6 +4,6 @@
 * Hazelcast source code can be found at https://github.com/hazelcast/hazelcast[GitHub/Hazelcast^].
 This is also where you can contribute and report issues.
 * Hazelcast API can be found at https://docs.hazelcast.org/docs/latest/javadoc/[hazelcast.org/docs/Javadoc^].
-* Code samples can be downloaded from https://hazelcast.org/imdg/download/[hazelcast.org/download^].
+* Code samples can be downloaded from https://github.com/hazelcast/hazelcast-code-samples[GitHub/hazelcast-code-samples^].
 * More use cases and resources can be found at http://www.hazelcast.com[hazelcast.com^].
 * xref:getting-started:support.adoc[Support information].