Clarify overlapping event rules

[harshil1712]

Summary

Add notes to clarify overlapping event rules. Fixes #17949

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Original Link	Updated Link
https://developers.cloudflare.com/r2/buckets/event-notifications/	https://r2-event-notification-note.cloudflare-docs-7ou.pages.dev/r2/buckets/event-notifications/

[bthwaites]

This isn't quite accurate. You would be allowed to configure one rule with PutObject, prefix a/, and another with CopyObject, prefix a/. The key point is that we will reject any rule that overlaps with another rule such that multiple rules may trigger from the same R2 request. I'd suggest something like this:

• Rule prefixes and suffixes for the same R2 action may not overlap in such a way that could cause multiple rules to trigger at once. For example, a rule with PutObject and prefix * and a rule with PutObject and prefix a/ would both match an object named a/b, and therefore may not be configured at the same time.

What do you think @jonesphillip ?

[harshil1712]

Thank you @bthwaites. I checked with @jonesphillip and have made the changes.