Improvements to Iceberg Catalog Descriptions

[911432]

Proposed Change

Please improve the Iceberg Catalog introduction page like this. Because I don't know which server has REST Catalog.

Proposal document

No response

Specifications

• [ ] Table
• [ ] View
• [X] REST
• [ ] Puffin
• [ ] Encryption
• [ ] Other

[911432]

We should introduce you to this page where We can use REST Catalog.