Update documentation in IReminderTable

[rubenwe]

I ran into issues when writing a Firestore-based implementation of Reminders.
In my case, Orleans calls into the ReminderTable implementation with begin: 0 and end: 0.

Based on the existing documentation one could have two interpretations:

• No entries should be returned; as given the range, no entry can be bigger than 0 and also smaller or equal to 0
• The entry with hash 0 should be returned

But given this left reminders inoperable, these interpretations don't seem to be correct.

When digging in the contrib repo, I found the handling in the MongoDB ReminderTable to interpret this case as "either bigger than begin or smaller or equal to end". This seems to have the intended effect in my implementation as well.

If this is how it is supposed to work, I think the documentation should be adjusted.

Thanks and have a great day!

Microsoft Reviewers: Open in CodeFlow