feat: update dataFrom with use of generator (#2793)

* feat: adds example extract/find use case to dataFrom example

Signed-off-by: Lucas Pimentel Quintao <lucaspimentel123@users.noreply.github.com>

docs/snippets/full-external-secret.yaml

@@ -86,6 +86,15 @@ spec:
 
   # Used to fetch all properties from the Provider key
   # If multiple dataFrom are specified, secrets are merged in the specified order
+  # Can be defined using sourceRef.generatorRef or extract / find
+  # Both use cases are exemplified below
+  dataFrom:
+  - sourceRef:
+      generatorRef:
+        apiVersion: generators.external-secrets.io/v1alpha1
+        kind: ECRAuthorizationToken
+        name: "my-ecr"
+  #Or
   dataFrom:
   - extract:
       key: database-credentials