Fix sessions drivers docs regarding unstorage compatibility

[ArmandPhilippot]

Description (required)

Updates our docs around sessions drivers and unstorage compatibility.

• In guides/sessions.mdx:
  • we also need to install ioredis: without the package, TypeScript complains that host doesn't exist.
  • update the code snippet to workaround the incompatibility
• In session-driver-reference.mdx:
  • reword the "Unstorage compatibility" section as this is not compatible with the SessionDriver type
  • format the code snippets
  • fix the last code snippets to workaround the issue
  • do not fix the tls issue I reported: I was wrong, this is available. This is the same issue as host; we need ioredis. Some options are set in unstorage (that's why ttl is available and not tls for example) and others in ioredis (we need to install the package).

References

• Related to Conflicting types in the "Unstorage compatibility" example #14339 (not closing on purpose as Florian is trying to fix the issue upstream)
• Supersedes docs: fix Unstorage session driver examples #14409 (stale, automated PR with no reactions from the author... including elsewhere, e.g. docs(browser): clarify vi.mock placement for module mocking vitest-dev/vitest#10965)

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en/guides/sessions.mdx	Source changed, localizations will be marked as outdated.
en/reference/session-driver-reference.mdx	Source changed, localizations will be marked as outdated.

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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.

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