chore: Update discovery artifacts (#1379)

## Deleted keys were detected in the following stable discovery artifacts:
servicemanagement v1 https://github.com/googleapis/google-api-python-client/commit/ac046117b12b43e03e748ebd0c442b340ed99183

## Discovery Artifact Change Summary:
feat(adexchangebuyer2): update the api https://github.com/googleapis/google-api-python-client/commit/e1ebe49bc9e2e007c61188202f0345c96083c19a
feat(displayvideo): update the api https://github.com/googleapis/google-api-python-client/commit/4f37d8b0d43f2172fdae627605947b3ba15b06c2
feat(gkehub): update the api https://github.com/googleapis/google-api-python-client/commit/e12ff0958ed9016356c8711039a15334d2f0d6f6
feat(servicemanagement): update the api https://github.com/googleapis/google-api-python-client/commit/ac046117b12b43e03e748ebd0c442b340ed99183
feat(spanner): update the api https://github.com/googleapis/google-api-python-client/commit/43f1be2ea175a79e463d77cf3155e7b8ab1b26f6
diff --git a/docs/dyn/displayvideo_v1.advertisers.insertionOrders.html b/docs/dyn/displayvideo_v1.advertisers.insertionOrders.html
index 36fe42d..963c8a0 100644
--- a/docs/dyn/displayvideo_v1.advertisers.insertionOrders.html
+++ b/docs/dyn/displayvideo_v1.advertisers.insertionOrders.html
@@ -283,6 +283,10 @@
         "targetingOptionId": "A String", # Required. The targeting_option_id of a TargetingOption of type `TARGETING_TYPE_LANGUAGE`.
       },
       "name": "A String", # Output only. The resource name for this assigned targeting option.
+      "nativeContentPositionDetails": { # Details for native content position assigned targeting option. This will be populated in the native_content_position_details field when targeting_type is `TARGETING_TYPE_NATIVE_CONTENT_POSITION`. Explicitly targeting all options is not supported. Remove all native content position targeting options to achieve this effect. # Native content position details. This field will be populated when the targeting_type is `TARGETING_TYPE_NATIVE_CONTENT_POSITION`.
+        "contentPosition": "A String", # Output only. The content position.
+        "targetingOptionId": "A String", # Required. The targeting_option_id field when targeting_type is `TARGETING_TYPE_NATIVE_CONTENT_POSITION`.
+      },
       "negativeKeywordListDetails": { # Targeting details for negative keyword list. This will be populated in the details field of an AssignedTargetingOption when targeting_type is `TARGETING_TYPE_NEGATIVE_KEYWORD_LIST`. # Keyword details. This field will be populated when the targeting_type is `TARGETING_TYPE_NEGATIVE_KEYWORD_LIST`. A maximum of 4 negative keyword lists can be assigned to a resource.
         "negativeKeywordListId": "A String", # Required. ID of the negative keyword list. Should refer to the negative_keyword_list_id field of a NegativeKeywordList resource.
       },