Update label selectors caution about OR operator (#17477)

content/en/docs/concepts/overview/working-with-objects/labels.md

@@ -92,6 +92,10 @@ them.
 For some API types, such as ReplicaSets, the label selectors of two instances must not overlap within a namespace, or the controller can see that as conflicting instructions and fail to determine how many replicas should be present.
 {{< /note >}}
 
+{{< caution >}} 
+For both equality-based and set-based conditions there is no logical _OR_ (`||`) operator. Ensure your filter statements are structured accordingly.
+{{< /caution >}}
+
 ### _Equality-based_ requirement
 
 _Equality-_ or _inequality-based_ requirements allow filtering by label keys and values. Matching objects must satisfy all of the specified label constraints, though they may have additional labels as well.