[DOCS] Clarify impact on model bounds

Author: lcawl

docs/en/stack/ml/buckets.asciidoc

@@ -31,7 +31,11 @@ high multi-bucket impact are depicted in the *Anomaly Explorer* and the
 *Single Metric Viewer* with a cross symbol instead of a dot. For example:
 
 [role="screenshot"]
-image::ml/images/multibucketanalysis.jpg["Examples of anomalies with multi-bucket impact in {kib}"] 
+image::ml/images/multibucketanalysis.jpg["Examples of anomalies with multi-bucket impact in {kib}"]
+
+In this example, you can see that some of the anomalies fall within the shaded
+blue area, which represents the bounds for the expected values. The bounds are
+calculated per bucket, but multi-bucket analysis is not limited by that scope.
 
 If you have more than one job, you can
 also obtain overall bucket results, which combine and correlate anomalies from