Update diff.md

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@@ -614,6 +614,8 @@ Similarly to source code suppressions, you can set the review status of reports
 
 :warning: Note: Review status rules act differently when runs are compared as opposed to when tags or dates are compared (see [below](#diff-on-tags-or-timestamps)).
 
+:warning: Note: If you are trying out with these examples, keep in mind that review status rules are _not_ deleted even if _all reports that it matches_ (by removing some or all runs in a given product) are. You will need to click on "Configuration" in the upper right corner, select "Review Status Rules", where these rules can be removed.
+
 ### Example: Setup
 
 Create `example.cpp` the same way as the previous examples: