docs(sessions): Correction about commitSession in non-cookie sessions

[penx]

Closes: #9444

• Docs
• n/a Tests

The docs for createCookieSessionStorage state:

With other session storage strategies you only have to commit it when it's created

https://remix.run/docs/en/main/utils/sessions#createcookiesessionstorage

When we moved from createCookieSessionStorage to another storage solution (createKvSessionStorage from @vercel/remix), we followed this advice and removed calls to commitSession (assuming it was not needed, and that session.set would be all that is required) but it resulted in sessions not being saved.

Elsewhere in the docs for createSessionStorage:

updateData will be called from commitSession

https://remix.run/docs/en/main/utils/sessions#createsessionstorage

Which seems to imply that anything based on createSessionStorage will require a call to commitSession in order to update the session, and I'm fairly sure explains why we would have bugs when removing calls to commitSession.

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