docs: fix broken Markdown content related links

[HiDeoo]

Description

Following the Astro Docs withastro/docs#9337 & withastro/docs#9344 pull requests, this PR fixes a few broken links related to Markdown content.

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Latest commit: 7189ce1

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Tracked Files

Locale	File	Note
en	components/using-components.mdx	Source changed, localizations will be marked as outdated.
en	guides/authoring-content.mdx	Source changed, localizations will be marked as outdated.

Warnings reference

Icon	Description
🔄️	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.

[delucis]

Ah great catch, thank you! (Second day in a row figuring out intricacies of Lunaria!)