Fix WN link by updating latest supported versions (#231)

From comparison with MC, we need x.y only.

Currently, link in What's New page
(https://docs.hazelcast.com/operator/5.13/whats-new) is broken - points
to
https://docs.hazelcast.com/operator/5.13/whats-new#5.5.0@hazelcast:ROOT:whats-new.adoc

docs/antora.yml

@@ -11,7 +11,7 @@ asciidoc:
     operator-chart-version: '5.13.0'
     page-toclevels: 1@
     # page-latest-supported versions are used for sample YAML files.
-    page-latest-supported-mc: '5.5.0'
-    page-latest-supported-hazelcast: '5.5.0'
+    page-latest-supported-mc: '5.5'
+    page-latest-supported-hazelcast: '5.5'
 nav:
 - modules/ROOT/nav.adoc