[docs] Refine "Section applicability differs from page applicability"

[colleenmcginnis]

Closes https://github.com/elastic/docs-content-internal/issues/218

Refine Section applicability differs from page applicability based on review comments in #1614, specifically:

• Discussing if there's should be a difference between how we tag pages with varying content related to deployment types and pages about serverless vs. stateful. Also, how to frame the differences to make it as easy as possible for docs contributors to understand. (comment)
• Reframe how this impacts the reader experience. (comment)
• Whether to double down on the positive applies_to badges on serverless vs. stateful pages. (comment)

[colleenmcginnis]

@elastic/docs-engineering why is it asking me to create redirects for images?

[github-actions]

🔍 Preview links for changed docs

• docs/contribute/cumulative-docs/example-scenarios.md
• docs/contribute/cumulative-docs/guidelines.md

[shainaraskas]

I think your explanation is really clear. I still think this is a tricky concept but this captures our reasoning.

possible enhancement: swap the serverless/stateful + deployment methods sections. there is more of the serverless/stateful problem in our docs and it's probably good to front-load it.

[florent-leborgne]

Nice!