fix(composer): update the API

#### composer:v1beta1

The following keys were changed:
- schemas.EncryptionConfig.description
- schemas.EnvironmentConfig.properties.encryptionConfig.description
- schemas.NodeConfig.properties.serviceAccount.description
- schemas.PrivateEnvironmentConfig.properties.enablePrivateEnvironment.description

discovery/composer-v1beta1.json

@@ -434,7 +434,7 @@
       }
     }
   },
-  "revision": "20210413",
+  "revision": "20210421",
   "rootUrl": "https://composer.googleapis.com/",
   "schemas": {
     "AllowedIpRange": {
@@ -492,7 +492,7 @@
       "type": "object"
     },
     "EncryptionConfig": {
-      "description": "The encryption options for the Composer environment and its dependencies.",
+      "description": "The encryption options for the Cloud Composer environment and its dependencies.",
       "id": "EncryptionConfig",
       "properties": {
         "kmsKeyName": {
@@ -581,7 +581,7 @@
         },
         "encryptionConfig": {
           "$ref": "EncryptionConfig",
-          "description": "Optional. The encryption options for the Composer environment and its dependencies. Cannot be updated."
+          "description": "Optional. The encryption options for the Cloud Composer environment and its dependencies. Cannot be updated."
         },
         "gkeCluster": {
           "description": "Output only. The Kubernetes Engine cluster used to run this environment.",
@@ -794,7 +794,7 @@
           "type": "array"
         },
         "serviceAccount": {
-          "description": "Optional. The Google Cloud Platform Service Account to be used by the node VMs. If a service account is not specified, the \"default\" Compute Engine service account is used. Cannot be updated.",
+          "description": "Optional. The Google Cloud Platform Service Account to be used by the workloads. If a service account is not specified, the \"default\" Compute Engine service account is used. Cannot be updated .",
           "type": "string"
         },
         "subnetwork": {
@@ -936,7 +936,7 @@
           "type": "string"
         },
         "enablePrivateEnvironment": {
-          "description": "Optional. If `true`, a Private IP Cloud Composer environment is created. If this field is set to true, `IPAllocationPolicy.use_ip_aliases` must be set to true.",
+          "description": "Optional. If `true`, a Private IP Cloud Composer environment is created. If this field is set to true, `IPAllocationPolicy.use_ip_aliases` must be set to true .",
           "type": "boolean"
         },
         "privateClusterConfig": {

src/apis/composer/v1beta1.ts

@@ -169,7 +169,7 @@ export namespace composer_v1beta1 {
    */
   export interface Schema$Empty {}
   /**
-   * The encryption options for the Composer environment and its dependencies.
+   * The encryption options for the Cloud Composer environment and its dependencies.
    */
   export interface Schema$EncryptionConfig {
     /**
@@ -227,7 +227,7 @@ export namespace composer_v1beta1 {
      */
     databaseConfig?: Schema$DatabaseConfig;
     /**
-     * Optional. The encryption options for the Composer environment and its dependencies. Cannot be updated.
+     * Optional. The encryption options for the Cloud Composer environment and its dependencies. Cannot be updated.
      */
     encryptionConfig?: Schema$EncryptionConfig;
     /**
@@ -406,7 +406,7 @@ export namespace composer_v1beta1 {
      */
     oauthScopes?: string[] | null;
     /**
-     * Optional. The Google Cloud Platform Service Account to be used by the node VMs. If a service account is not specified, the "default" Compute Engine service account is used. Cannot be updated.
+     * Optional. The Google Cloud Platform Service Account to be used by the workloads. If a service account is not specified, the "default" Compute Engine service account is used. Cannot be updated .
      */
     serviceAccount?: string | null;
     /**
@@ -498,7 +498,7 @@ export namespace composer_v1beta1 {
      */
     cloudSqlIpv4CidrBlock?: string | null;
     /**
-     * Optional. If `true`, a Private IP Cloud Composer environment is created. If this field is set to true, `IPAllocationPolicy.use_ip_aliases` must be set to true.
+     * Optional. If `true`, a Private IP Cloud Composer environment is created. If this field is set to true, `IPAllocationPolicy.use_ip_aliases` must be set to true .
      */
     enablePrivateEnvironment?: boolean | null;
     /**