5.1.0 Minor Docs

[sarah11918]

Description (required)

Minor release docs for 5.1.0

Includes:
#10377 - remote image caching
#10353 - getActionPath()
#10378 - experimental Sessions API
#10462 - Sessions error messages

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Tracked Files

File	Note
en/guides/images.mdx	Source changed, localizations will be marked as outdated.
en/reference/error-reference.mdx	Source changed, localizations will be marked as outdated.
en/reference/errors/session-storage-init-error.mdx	Localization added, will be marked as complete.
en/reference/errors/session-storage-save-error.mdx	Localization added, will be marked as complete.
en/reference/experimental-flags/sessions.mdx	Localization added, will be marked as complete.
en/reference/modules/astro-actions.mdx	Source changed, localizations will be marked as outdated.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.