chore: Update discovery artifacts (#1344)

chore: update docs/dyn/index.md
chore(acceleratedmobilepageurl): update the api
chore(accesscontextmanager): update the api
chore(adexchangebuyer): update the api
chore(adexchangebuyer2): update the api
chore(admob): update the api
chore(adsense): update the api
feat(analyticsadmin): update the api
chore(analyticsdata): update the api
chore(androiddeviceprovisioning): update the api
chore(androidpublisher): update the api
chore(apigateway): update the api
chore(apigee): update the api
chore(apikeys): update the api
chore(appengine): update the api
chore(area120tables): update the api
chore(artifactregistry): update the api
feat(bigquery): update the api
chore(bigqueryconnection): update the api
chore(bigqueryreservation): update the api
chore(bigtableadmin): update the api
chore(binaryauthorization): update the api
chore(blogger): update the api
chore(books): update the api
chore(calendar): update the api
chore(chat): update the api
chore(chromemanagement): update the api
chore(chromepolicy): update the api
chore(chromeuxreport): update the api
chore(classroom): update the api
chore(cloudasset): update the api
chore(cloudbuild): update the api
chore(cloudchannel): update the api
chore(clouddebugger): update the api
chore(clouderrorreporting): update the api
chore(cloudfunctions): update the api
chore(cloudidentity): update the api
chore(cloudiot): update the api
chore(cloudkms): update the api
chore(cloudprofiler): update the api
chore(cloudresourcemanager): update the api
chore(cloudsearch): update the api
chore(cloudshell): update the api
chore(cloudtrace): update the api
chore(container): update the api
chore(containeranalysis): update the api
chore(content): update the api
chore(customsearch): update the api
chore(dataflow): update the api
chore(deploymentmanager): update the api
chore(dialogflow): update the api
chore(displayvideo): update the api
chore(dlp): update the api
feat(documentai): update the api
chore(domainsrdap): update the api
chore(doubleclickbidmanager): update the api
chore(doubleclicksearch): update the api
chore(driveactivity): update the api
chore(essentialcontacts): update the api
chore(eventarc): update the api
chore(factchecktools): update the api
chore(fcm): update the api
chore(file): update the api
chore(firebase): update the api
chore(firebasedatabase): update the api
chore(firebaseml): update the api
chore(fitness): update the api
chore(games): update the api
chore(gamesConfiguration): update the api
chore(gamesManagement): update the api
feat(gameservices): update the api
chore(genomics): update the api
chore(gkehub): update the api
chore(gmail): update the api
chore(gmailpostmastertools): update the api
chore(groupssettings): update the api
chore(healthcare): update the api
chore(homegraph): update the api
chore(iam): update the api
chore(iamcredentials): update the api
chore(iap): update the api
chore(language): update the api
chore(libraryagent): update the api
chore(lifesciences): update the api
chore(memcache): update the api
chore(metastore): update the api
chore(ml): update the api
feat(monitoring): update the api
feat(mybusinessaccountmanagement): update the api
chore(mybusinesslodging): update the api
chore(mybusinessplaceactions): update the api
feat(networkmanagement): update the api
chore(ondemandscanning): update the api
chore(orgpolicy): update the api
chore(osconfig): update the api
feat(oslogin): update the api
chore(pagespeedonline): update the api
chore(paymentsresellersubscription): update the api
chore(people): update the api
chore(playablelocations): update the api
chore(playcustomapp): update the api
chore(policysimulator): update the api
chore(poly): update the api
chore(privateca): update the api
chore(prod_tt_sasportal): update the api
chore(pubsub): update the api
feat(pubsublite): update the api
chore(realtimebidding): update the api
feat(recommender): update the api
chore(redis): update the api
chore(remotebuildexecution): update the api
chore(reseller): update the api
chore(retail): update the api
chore(run): update the api
chore(safebrowsing): update the api
chore(sasportal): update the api
chore(searchconsole): update the api
chore(secretmanager): update the api
chore(securitycenter): update the api
chore(serviceconsumermanagement): update the api
feat(servicenetworking): update the api
chore(serviceusage): update the api
chore(slides): update the api
chore(sourcerepo): update the api
chore(speech): update the api
chore(sqladmin): update the api
chore(storage): update the api
chore(storagetransfer): update the api
chore(streetviewpublish): update the api
chore(sts): update the api
chore(tagmanager): update the api
chore(tasks): update the api
chore(testing): update the api
chore(toolresults): update the api
chore(tpu): update the api
chore(trafficdirector): update the api
chore(vault): update the api
chore(vectortile): update the api
chore(vision): update the api
chore(webrisk): update the api
chore(workflowexecutions): update the api
chore(workflows): update the api
chore(youtube): update the api
chore(youtubeAnalytics): update the api
chore(youtubereporting): update the api
chore(docs): Add new discovery artifacts and reference documents
diff --git a/googleapiclient/discovery_cache/documents/speech.v1p1beta1.json b/googleapiclient/discovery_cache/documents/speech.v1p1beta1.json
index f040854..6d8caae 100644
--- a/googleapiclient/discovery_cache/documents/speech.v1p1beta1.json
+++ b/googleapiclient/discovery_cache/documents/speech.v1p1beta1.json
@@ -524,7 +524,7 @@
       }
     }
   },
-  "revision": "20210428",
+  "revision": "20210429",
   "rootUrl": "https://speech.googleapis.com/",
   "schemas": {
     "ClassItem": {
@@ -881,7 +881,8 @@
             "AMR_WB",
             "OGG_OPUS",
             "SPEEX_WITH_HEADER_BYTE",
-            "MP3"
+            "MP3",
+            "WEBM_OPUS"
           ],
           "enumDescriptions": [
             "Not specified.",
@@ -892,7 +893,8 @@
             "Adaptive Multi-Rate Wideband codec. `sample_rate_hertz` must be 16000.",
             "Opus encoded audio frames in Ogg container ([OggOpus](https://wiki.xiph.org/OggOpus)). `sample_rate_hertz` must be one of 8000, 12000, 16000, 24000, or 48000.",
             "Although the use of lossy encodings is not recommended, if a very low bitrate encoding is required, `OGG_OPUS` is highly preferred over Speex encoding. The [Speex](https://speex.org/) encoding supported by Cloud Speech API has a header byte in each block, as in MIME type `audio/x-speex-with-header-byte`. It is a variant of the RTP Speex encoding defined in [RFC 5574](https://tools.ietf.org/html/rfc5574). The stream is a sequence of blocks, one block per RTP packet. Each block starts with a byte containing the length of the block, in bytes, followed by one or more frames of Speex data, padded to an integral number of bytes (octets) as specified in RFC 5574. In other words, each RTP header is replaced with a single byte containing the block length. Only Speex wideband is supported. `sample_rate_hertz` must be 16000.",
-            "MP3 audio. MP3 encoding is a Beta feature and only available in v1p1beta1. Support all standard MP3 bitrates (which range from 32-320 kbps). When using this encoding, `sample_rate_hertz` has to match the sample rate of the file being used."
+            "MP3 audio. MP3 encoding is a Beta feature and only available in v1p1beta1. Support all standard MP3 bitrates (which range from 32-320 kbps). When using this encoding, `sample_rate_hertz` has to match the sample rate of the file being used.",
+            "Opus encoded audio frames in WebM container ([OggOpus](https://wiki.xiph.org/OggOpus)). This is a Beta features and only available in v1p1beta1. `sample_rate_hertz` must be one of 8000, 12000, 16000, 24000, or 48000."
           ],
           "type": "string"
         },