docs: [google-cloud-essential-contacts] Marks the google.cloud.essentialcontacts.v1.Contact.validation_state field as output_only (#13165)

- [ ] Regenerate this pull request now.

PiperOrigin-RevId: 685731240

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googleapis/googleapis@f78cd2f

Source-Link:
googleapis/googleapis-gen@1d05fdc
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Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: Victor Chudnovsky <vchudnov@google.com>

Author: gcf-owl-bot[bot]

packages/google-cloud-essential-contacts/google/cloud/essential_contacts_v1/types/service.py

@@ -61,9 +61,10 @@ class Contact(proto.Message):
             languages <https://cloud.google.com/resource-manager/docs/managing-notification-contacts#supported-languages>`__
             for a list of supported languages.
         validation_state (google.cloud.essential_contacts_v1.types.ValidationState):
-            The validity of the contact. A contact is
-            considered valid if it is the correct recipient
-            for notifications for a particular resource.
+            Output only. The validity of the contact. A
+            contact is considered valid if it is the correct
+            recipient for notifications for a particular
+            resource.
         validate_time (google.protobuf.timestamp_pb2.Timestamp):
             The last time the validation_state was updated, either
             manually or automatically. A contact is considered stale if