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/gkehub_v1.projects.locations.html b/docs/dyn/gkehub_v1.projects.locations.html
index 1f8d32b..c65eabb 100644
--- a/docs/dyn/gkehub_v1.projects.locations.html
+++ b/docs/dyn/gkehub_v1.projects.locations.html
@@ -75,6 +75,11 @@
 <h1><a href="gkehub_v1.html">GKE Hub</a> . <a href="gkehub_v1.projects.html">projects</a> . <a href="gkehub_v1.projects.locations.html">locations</a></h1>
 <h2>Instance Methods</h2>
 <p class="toc_element">
+  <code><a href="gkehub_v1.projects.locations.features.html">features()</a></code>
+</p>
+<p class="firstline">Returns the features Resource.</p>
+
+<p class="toc_element">
   <code><a href="gkehub_v1.projects.locations.memberships.html">memberships()</a></code>
 </p>
 <p class="firstline">Returns the memberships Resource.</p>