Improvements to the visibility of deprecated/experimental/beta paragraphs

[lcawl]

The method that we use to draw attention to additions/deprecations or experimental features is described here:
https://github.com/elastic/docs#additions-and-deprecations

Unfortunately, the inline version of this text is not very eye-catching and requires users to hover it for more information. For example, see the problem description in elastic/kibana#47620

Can we improve the look and feel so paragraphs that are experimental/beta/deprecation-related are more like a regular admonition block (https://asciidoctor.org/docs/user-manual/#admonition)?

This wouldn't help lists that contain such items, but hopefully it's a step in the right direction.