chore: Update discovery artifacts (#1541)

## Discovery Artifact Change Summary:
feat(analyticsadmin): update the api https://github.com/googleapis/google-api-python-client/commit/c14c42a82fbd61df00b690daa328cea212441f59
feat(appengine): update the api https://github.com/googleapis/google-api-python-client/commit/22e6b63271836d2b195191c0711d3e815d7b3f29
feat(bigquery): update the api https://github.com/googleapis/google-api-python-client/commit/5325b3654e42e393911f088e9a8358aeaf733c03
feat(content): update the api https://github.com/googleapis/google-api-python-client/commit/df08fb1f3823a5edc96e6caebe24df66e943fa36
feat(dialogflow): update the api https://github.com/googleapis/google-api-python-client/commit/eaa0b250682d593572168427d92b0c3b9438a503
feat(firestore): update the api https://github.com/googleapis/google-api-python-client/commit/89ee485ce0646fb14d4f4e1d7aae095e504cf4be
feat(gkehub): update the api https://github.com/googleapis/google-api-python-client/commit/982014c5e33c29f2e0030b950b2f2ac27afa3f8f
feat(monitoring): update the api https://github.com/googleapis/google-api-python-client/commit/440201ddeeae876ab83863def611ec39649d397c
fix(oslogin): update the api https://github.com/googleapis/google-api-python-client/commit/e940d95d04a6aba60b89ece3fd630cc0ab5cde2a
feat(retail): update the api https://github.com/googleapis/google-api-python-client/commit/58f1c1ba076ed6ecc389ddf66d0c5ac609cd9d17
feat(servicenetworking): update the api https://github.com/googleapis/google-api-python-client/commit/53d51411d39049a98df6909ae16f9c5dfee4f432
diff --git a/docs/dyn/bigquery_v2.jobs.html b/docs/dyn/bigquery_v2.jobs.html
index 69ae2ad..b9f6b6f 100644
--- a/docs/dyn/bigquery_v2.jobs.html
+++ b/docs/dyn/bigquery_v2.jobs.html
@@ -82,7 +82,7 @@
 <p class="firstline">Close httplib2 connections.</p>
 <p class="toc_element">
   <code><a href="#delete">delete(projectId, jobId, location=None)</a></code></p>
-<p class="firstline">Requests that a job is deleted. This call will return when the job is deleted. This method is available in limited preview.</p>
+<p class="firstline">Requests the deletion of the metadata of a job. This call returns when the job's metadata is deleted.</p>
 <p class="toc_element">
   <code><a href="#get">get(projectId, jobId, location=None)</a></code></p>
 <p class="firstline">Returns information about a specific job. Job information is available for a six month period after creation. Requires that you're the person who ran the job, or have the Is Owner project role.</p>
@@ -728,11 +728,11 @@
 
 <div class="method">
     <code class="details" id="delete">delete(projectId, jobId, location=None)</code>
-  <pre>Requests that a job is deleted. This call will return when the job is deleted. This method is available in limited preview.
+  <pre>Requests the deletion of the metadata of a job. This call returns when the job&#x27;s metadata is deleted.
 
 Args:
-  projectId: string, Required. Project ID of the job to be deleted. (required)
-  jobId: string, Required. Job ID of the job to be deleted. If this is a parent job which has child jobs, all child jobs will be deleted as well. Deletion of child jobs directly is not allowed. (required)
+  projectId: string, Required. Project ID of the job for which metadata is to be deleted. (required)
+  jobId: string, Required. Job ID of the job for which metadata is to be deleted. If this is a parent job which has child jobs, the metadata from all child jobs will be deleted as well. Direct deletion of the metadata of child jobs is not allowed. (required)
   location: string, The geographic location of the job. Required. See details at: https://cloud.google.com/bigquery/docs/locations#specifying_your_location.
 </pre>
 </div>