fix(vault): update the API

#### vault:v1

The following keys were changed:
- description

discovery/vault-v1.json

@@ -15,7 +15,7 @@
   "baseUrl": "https://vault.googleapis.com/",
   "batchPath": "batch",
   "canonicalName": "Vault",
-  "description": "Archiving and eDiscovery for G Suite.",
+  "description": "Retention and eDiscovery for Google Workspace. To work with Vault resources, the account must have the [required Vault privileges] (https://support.google.com/vault/answer/2799699) and access to the matter. To access a matter, the account must have created the matter, have the matter shared with them, or have the **View All Matters** privilege. For example, to download an export, an account needs the **Manage Exports** privilege and the matter shared with them. ",
   "discoveryVersion": "v1",
   "documentationLink": "https://developers.google.com/vault",
   "fullyEncodeReservedExpansion": true,
@@ -1193,7 +1193,7 @@
       }
     }
   },
-  "revision": "20210406",
+  "revision": "20210419",
   "rootUrl": "https://vault.googleapis.com/",
   "schemas": {
     "AccountCount": {

src/apis/vault/v1.ts

@@ -103,7 +103,7 @@ export namespace vault_v1 {
   /**
    * G Suite Vault API
    *
-   * Archiving and eDiscovery for G Suite.
+   * Retention and eDiscovery for Google Workspace. To work with Vault resources, the account must have the [required Vault privileges] (https://support.google.com/vault/answer/2799699) and access to the matter. To access a matter, the account must have created the matter, have the matter shared with them, or have the **View All Matters** privilege. For example, to download an export, an account needs the **Manage Exports** privilege and the matter shared with them.
    *
    * @example
    * ```js