Resolve "Improve Container Registry description"

What does this MR do?

Improves Container Registry description.

Why was this MR needed?

The current text is really misleading.

Screenshots (if relevant)

Before	After

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #30651 (closed)