Update node affinity example in docs
The example describes setting up a label on the node that is used for affinity but defines a `matchFields` in the affinity spec. The change updates the example to use `matchExpressions` to check the node label
@@ -382,7 +382,7 @@ spec:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- - matchFields:
+ - matchExpressions:
- key: workload-role
operator: In
values:
