[v6] stabilize experimental.headingIdCompat

[florian-lefebvre]

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For Astro version: 6.0. See astro PR #14494.

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en/guides/upgrade-to/v6.mdx	Source changed, localizations will be marked as outdated.
en/reference/experimental-flags/heading-id-compat.mdx	Source removed, will stop being tracked.
es/reference/experimental-flags/heading-id-compat.mdx	Localization removed, will be marked as missing.
fr/reference/experimental-flags/heading-id-compat.mdx	Localization removed, will be marked as missing.
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zh-cn/reference/experimental-flags/heading-id-compat.mdx	Localization removed, will be marked as missing.

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[sarah11918]

Looks good, but see my comment re: including how to build a custom rehype plugin inside this guide 😅

[sarah11918]

Some tiny edits below, mostly based on I think that the big idea here is the change that people who have previously done nothing will face! Most people will now find themselves with heading id's autogenerated differently now (few will have been using the experimental flag, for example), and those are the people who need to realize that this affects them, and what they need to do specifically (which is probably updating links in their Markdown)

[sarah11918]

LGTM!