Add note about email isRead marker with kopia-assisted incrementals (#1730)

## Description

Kopia-assisted incrementals will not find changes to emails being marked/unmarked as read because that operation does not update the mod time in Exchange.

## Type of change

- [ ] 🌻 Feature
- [ ] 🐛 Bugfix
- [x] 🗺️ Documentation
- [ ] 🤖 Test
- [ ] 💻 CI/Deployment
- [ ] 🐹 Trivial/Minor

## Issue(s)

* closes #1693 

## Test Plan

- [x] 💪 Manual
- [ ]  Unit test
- [ ] 💚 E2E
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ashmrtn 2022-12-08 12:46:00 -08:00 committed by GitHub
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@ -5,6 +5,9 @@ Below is a list of known Corso issues and limitations:
* Only supports Exchange (email, calendars, contact) and OneDrive (files) M365 data. Additional
data types and services will be added in subsequent releases.
* Backups of Exchange email may not include changes to the read status of an email if no other changes
to the email have been made since the previous backup.
* Restores are non-destructive to a dedicated restore folder in the original Exchange mailbox or OneDrive account.
Advanced restore options such as in-place restore, or restore to a specific folder or to a different account aren't
yet supported.