docs: add organization context to custom token claims

[simeng-li]

Summary

Documents the new organization context exposed to the custom JWT / custom token claims script.

In Create a custom access token script, the context section now lists an Organization data object alongside the existing user / grant / user-interaction objects. For organization access tokens, the script receives the target organization via context.organization (id, name, description, customData), so authors can attach per-organization claims — e.g. mapping the Logto organization ID to an internal ID stored in the organization's custom data.

Notes

• This documents the feature added in feat(core): expose organization context to jwt customizer logto#9069, which is currently behind the isDevFeaturesEnabled flag. Hold/merge this to line up with that feature's release.
• Both internal links resolve to existing pages (/authorization/organization-template, /organizations/organization-management#organization-data-structure).
• Translations are left to the docs translation flow.

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