feat(pubsublite): update the api

#### pubsublite:v1

The following keys were added:
- resources.admin.resources.projects.resources.locations.resources.subscriptions.methods.create.parameters.skipBacklog (Total Keys: 2)

Author: yoshi-automation

docs/dyn/pubsublite_v1.admin.projects.locations.subscriptions.html

@@ -78,7 +78,7 @@ <h2>Instance Methods</h2>
   <code><a href="#close">close()</a></code></p>
 <p class="firstline">Close httplib2 connections.</p>
 <p class="toc_element">
-  <code><a href="#create">create(parent, body=None, subscriptionId=None, x__xgafv=None)</a></code></p>
+  <code><a href="#create">create(parent, body=None, skipBacklog=None, subscriptionId=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Creates a new subscription.</p>
 <p class="toc_element">
   <code><a href="#delete">delete(name, x__xgafv=None)</a></code></p>
@@ -102,7 +102,7 @@ <h3>Method Details</h3>
 </div>
 
 <div class="method">
-    <code class="details" id="create">create(parent, body=None, subscriptionId=None, x__xgafv=None)</code>
+    <code class="details" id="create">create(parent, body=None, skipBacklog=None, subscriptionId=None, x__xgafv=None)</code>
   <pre>Creates a new subscription.
 
 Args:
@@ -118,6 +118,7 @@ <h3>Method Details</h3>
   &quot;topic&quot;: &quot;A String&quot;, # The name of the topic this subscription is attached to. Structured like: projects/{project_number}/locations/{location}/topics/{topic_id}
 }
 
+  skipBacklog: boolean, If true, the newly created subscription will only receive messages published after the subscription was created. Otherwise, the entire message backlog will be received on the subscription. Defaults to false.
   subscriptionId: string, Required. The ID to use for the subscription, which will become the final component of the subscription&#x27;s name. This value is structured like: `my-sub-name`.
   x__xgafv: string, V1 error format.
     Allowed values

docs/dyn/pubsublite_v1.topicStats.projects.locations.topics.html

@@ -79,7 +79,7 @@ <h2>Instance Methods</h2>
 <p class="firstline">Close httplib2 connections.</p>
 <p class="toc_element">
   <code><a href="#computeHeadCursor">computeHeadCursor(topic, body=None, x__xgafv=None)</a></code></p>
-<p class="firstline">Compute the head cursor for the partition. The head cursor’s offset is guaranteed to be before or equal to all messages which have not yet been acknowledged to be published, and greater than the offset of any message whose publish has already been acknowledged. It is 0 if there have never been messages on the partition.</p>
+<p class="firstline">Compute the head cursor for the partition. The head cursor's offset is guaranteed to be less than or equal to all messages which have not yet been acknowledged as published, and greater than the offset of any message whose publish has already been acknowledged. It is zero if there have never been messages in the partition.</p>
 <p class="toc_element">
   <code><a href="#computeMessageStats">computeMessageStats(topic, body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Compute statistics about a range of messages in a given topic and partition.</p>
@@ -91,7 +91,7 @@ <h3>Method Details</h3>
 
 <div class="method">
     <code class="details" id="computeHeadCursor">computeHeadCursor(topic, body=None, x__xgafv=None)</code>
-  <pre>Compute the head cursor for the partition. The head cursor’s offset is guaranteed to be before or equal to all messages which have not yet been acknowledged to be published, and greater than the offset of any message whose publish has already been acknowledged. It is 0 if there have never been messages on the partition.
+  <pre>Compute the head cursor for the partition. The head cursor&#x27;s offset is guaranteed to be less than or equal to all messages which have not yet been acknowledged as published, and greater than the offset of any message whose publish has already been acknowledged. It is zero if there have never been messages in the partition.
 
 Args:
   topic: string, Required. The topic for which we should compute the head cursor. (required)

googleapiclient/discovery_cache/documents/pubsublite.v1.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"
                 }
             }
         }
@@ -129,6 +129,11 @@
                                                     "required": true,
                                                     "type": "string"
                                                 },
+                                                "skipBacklog": {
+                                                    "description": "If true, the newly created subscription will only receive messages published after the subscription was created. Otherwise, the entire message backlog will be received on the subscription. Defaults to false.",
+                                                    "location": "query",
+                                                    "type": "boolean"
+                                                },
                                                 "subscriptionId": {
                                                     "description": "Required. The ID to use for the subscription, which will become the final component of the subscription's name. This value is structured like: `my-sub-name`.",
                                                     "location": "query",
@@ -563,7 +568,7 @@
                                 "topics": {
                                     "methods": {
                                         "computeHeadCursor": {
-                                            "description": "Compute the head cursor for the partition. The head cursor\u2019s offset is guaranteed to be before or equal to all messages which have not yet been acknowledged to be published, and greater than the offset of any message whose publish has already been acknowledged. It is 0 if there have never been messages on the partition.",
+                                            "description": "Compute the head cursor for the partition. The head cursor's offset is guaranteed to be less than or equal to all messages which have not yet been acknowledged as published, and greater than the offset of any message whose publish has already been acknowledged. It is zero if there have never been messages in the partition.",
                                             "flatPath": "v1/topicStats/projects/{projectsId}/locations/{locationsId}/topics/{topicsId}:computeHeadCursor",
                                             "httpMethod": "POST",
                                             "id": "pubsublite.topicStats.projects.locations.topics.computeHeadCursor",
@@ -627,7 +632,7 @@
             }
         }
     },
-    "revision": "20210224",
+    "revision": "20210322",
     "rootUrl": "https://pubsublite.googleapis.com/",
     "schemas": {
         "Capacity": {