fix: consistent headings format in content-loader-reference.mdx

[ArmandPhilippot]

Same as #13315 and #13316

For context: In #13021 (comment), we decided we preferred parent.child as headings instead of child both for readability and linking. We already use this format in some modules reference (e.g. envField) but most of the modules were using the old format (e.g. action).

Description (required)

Updates content-loader-reference.mdx to use a consistent heading format (parent.child).

I also removed two headings (Loader properties and Live loader properties) because we usually don't use those... and I feel this is no longer necessary with the parent.child notation. (btw we had a nesting issue for one of them)

This one implies a lot of links updates... but I personally think this is nice (e.g. #entries-1 vs #livedatacollectionentries).

Related issues & labels (optional)

• Suggested label: v6, consistency/formatting

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en/guides/content-collections.mdx	Source changed, localizations will be marked as outdated.
en/guides/markdown-content.mdx	Source changed, localizations will be marked as outdated.
en/guides/upgrade-to/v6.mdx	Localization changed, will be marked as complete.
en/reference/content-loader-reference.mdx	Source changed, localizations will be marked as outdated.
en/reference/integrations-reference.mdx	Source changed, localizations will be marked as outdated.
en/reference/modules/astro-content.mdx	Source changed, localizations will be marked as outdated.
ru/reference/integrations-reference.mdx	Localization changed, will be marked as complete.

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🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

[sarah11918]

Agreed! I love being able to get rid of #cachehint-2 😂 Great improvement!

[ArmandPhilippot]

Thanks! I take this as an explicit approval... If not, please scream while I update the branch. 😄