chore: Update discovery artifacts (#1308)

## Discovery Artifact Change Summary:
sqladminv1beta4[ [More details]](https://github.com/googleapis/google-api-python-client/commit/cc4e16a828715cc194d180da6c546126bcd829fe)

chore(accesscontextmanager): update the api
chore(apigateway): update the api
chore(area120tables): update the api
chore(bigquery): update the api
chore(bigqueryconnection): update the api
chore(chromemanagement): update the api
chore(chromepolicy): update the api
chore(chromeuxreport): update the api
chore(clouddebugger): update the api
chore(cloudscheduler): update the api
chore(container): update the api
chore(customsearch): update the api
chore(datalabeling): update the api
chore(datamigration): update the api
chore(essentialcontacts): update the api
chore(factchecktools): update the api
chore(firebase): update the api
chore(firebasedatabase): update the api
chore(gkehub): update the api
chore(gmailpostmastertools): update the api
chore(libraryagent): update the api
chore(lifesciences): update the api
chore(localservices): update the api
chore(monitoring): update the api
chore(networkmanagement): update the api
chore(orgpolicy): update the api
chore(pagespeedonline): update the api
chore(people): update the api
chore(playcustomapp): update the api
chore(prod_tt_sasportal): update the api
chore(pubsublite): update the api
chore(redis): update the api
chore(safebrowsing): update the api
chore(servicemanagement): update the api
feat(sqladmin): update the api
chore(streetviewpublish): update the api
chore(tpu): update the api
chore(trafficdirector): update the api
chore(docs): Add new discovery artifacts and reference documents
diff --git a/googleapiclient/discovery_cache/documents/cloudscheduler.v1beta1.json b/googleapiclient/discovery_cache/documents/cloudscheduler.v1beta1.json
index aa7f833..23cf827 100644
--- a/googleapiclient/discovery_cache/documents/cloudscheduler.v1beta1.json
+++ b/googleapiclient/discovery_cache/documents/cloudscheduler.v1beta1.json
@@ -3,7 +3,7 @@
     "oauth2": {
       "scopes": {
         "https://www.googleapis.com/auth/cloud-platform": {
-          "description": "View and manage your data across Google Cloud Platform services"
+          "description": "See, edit, configure, and delete your Google Cloud Platform data"
         }
       }
     }
@@ -156,7 +156,7 @@
                   "type": "string"
                 },
                 "pageSize": {
-                  "description": "The maximum number of results to return. If not set, the service will select a default.",
+                  "description": "The maximum number of results to return. If not set, the service selects a default.",
                   "format": "int32",
                   "location": "query",
                   "type": "integer"
@@ -428,7 +428,7 @@
       }
     }
   },
-  "revision": "20210315",
+  "revision": "20210420",
   "rootUrl": "https://cloudscheduler.googleapis.com/",
   "schemas": {
     "AppEngineHttpTarget": {