message: Update bot tag system enforcement
  I added the new rule that `Resolution-Duplicate` doesn't require the other tags. This documents the change.
diff: @@ -56,6 +56,7 @@ We'll be using tags, primarily, to help us understand what needs attention, what
  #### Enforce tag system
  - When an issue is opened or labels are changed in any way, we will check if the tagging matches the system. If not, it will get `Needs-Tag-Fix`. The system is to have an `Area-`, `Issue-`, and `Product-` tag for all open things, and also a `Resolution-` for closed ones.
  - When the tags from appropriate categories are applied, it will auto-remove the `Needs-Tag-Fix` tag.
  +- `Resolution-Duplicate` is sufficient to fix all tagging. (`Area-`, `Issue-`, and `Product-` are not needed for a duplicate.)
  ### PR Management
  