fix: Remove heading from above summary to ensure valid HTML

[novellac]

Description

This PR moves the h1 tag outside of the details element.

Motivation

Having the h1 above the summary element was invalid HTML, and since the h1 seemed to describe both of the details elements, it seemed like it would be better placed outside of the details element altogether.

Additional details

Related issues and pull requests

[github-actions]

Preview URLs

• /en-US/docs/Web/HTML/Element/summary

Flaws (23)

URL: /en-US/docs/Web/HTML/Element/summary
Title: <summary>: The Disclosure Summary element
Flaw count: 23

• macros:
  • Wrong xref macro used (consider changing which macro you use). Error processing path /en-US/docs/Learn/HTML
  • Wrong xref macro used (consider changing which macro you use). Error processing path /en-US/docs/Learn/Getting_started_with_the_web/HTML_basics
  • Wrong xref macro used (consider changing which macro you use). Error processing path /en-US/docs/Learn/HTML/Introduction_to_HTML
  • Wrong xref macro used (consider changing which macro you use). Error processing path /en-US/docs/Learn/HTML/Introduction_to_HTML/Getting_started
  • Wrong xref macro used (consider changing which macro you use). Error processing path /en-US/docs/Learn/HTML/Introduction_to_HTML/The_head_metadata_in_HTML
  • and 18 more flaws omitted

[wbamberg]

👍 thank you @novellac !