docs: improve Kubernetes Kit configuration documentation

[mcollovati]

Fixes vaadin/kubernetes-kit#248

[github-actions]

AI Language Review

The updated AsciiDoc file introduces a new section, "Common Settings," and adds properties with descriptions and default values to an organized table format. There are a few considerations:

1. Consistency in Terminology: In the "Hazelcast for Session Replication" section:

   • Ensure consistent terminology for "service-name" and "service-port" properties throughout the document. Ensure both terms are consistently hyphenated.

2. Section Introduction: For the newly added "Common Settings" table, consider providing a brief introduction to explain the purpose of these settings. This helps provide context to the reader, especially for new sections.

3. Additional Examples: In the "Hazelcast for Session Replication" aside note, it mentions a specific configuration for a HazelcastInstance bean. Consider adding a brief example to illustrate the configuration with hazelcast.shutdownhook.enabled=false.

These improvements will enhance clarity and consistency across the document.