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/index.md b/docs/dyn/index.md
index d800b6b..ae9ba5f 100644
--- a/docs/dyn/index.md
+++ b/docs/dyn/index.md
@@ -443,6 +443,10 @@
 * [v1beta1](http://googleapis.github.io/google-api-python-client/docs/dyn/firebase_v1beta1.html)
 
 
+## firebaseappcheck
+* [v1beta](http://googleapis.github.io/google-api-python-client/docs/dyn/firebaseappcheck_v1beta.html)
+
+
 ## firebasedatabase
 * [v1beta](http://googleapis.github.io/google-api-python-client/docs/dyn/firebasedatabase_v1beta.html)
 
@@ -662,6 +666,7 @@
 
 ## osconfig
 * [v1](http://googleapis.github.io/google-api-python-client/docs/dyn/osconfig_v1.html)
+* [v1alpha](http://googleapis.github.io/google-api-python-client/docs/dyn/osconfig_v1alpha.html)
 * [v1beta](http://googleapis.github.io/google-api-python-client/docs/dyn/osconfig_v1beta.html)