fix(certificatemanager): update the API

#### certificatemanager:v1

The following keys were changed:
- schemas.Certificate.properties.sanDnsnames.description
- schemas.Empty.description

discovery/certificatemanager-v1.json

@@ -975,7 +975,7 @@
       }
     }
   },
-  "revision": "20220223",
+  "revision": "20220329",
   "rootUrl": "https://certificatemanager.googleapis.com/",
   "schemas": {
     "AuthorizationAttemptInfo": {
@@ -1073,7 +1073,7 @@
           "type": "string"
         },
         "sanDnsnames": {
-          "description": "Output only. The list of Subject Alternative Names of dnsName type defined in the certificate (see RFC 5280 4.2.1.6)",
+          "description": "Output only. The list of Subject Alternative Names of dnsName type defined in the certificate (see RFC 5280 4.2.1.6). Managed certificates that haven't been provisioned yet have this field populated with a value of the managed.domains field.",
           "items": {
             "type": "string"
           },
@@ -1285,7 +1285,7 @@
       "type": "object"
     },
     "Empty": {
-      "description": "A generic empty message that you can re-use to avoid defining duplicated empty messages in your APIs. A typical example is to use it as the request or the response type of an API method. For instance: service Foo { rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty); } The JSON representation for `Empty` is empty JSON object `{}`.",
+      "description": "A generic empty message that you can re-use to avoid defining duplicated empty messages in your APIs. A typical example is to use it as the request or the response type of an API method. For instance: service Foo { rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty); }",
       "id": "Empty",
       "properties": {},
       "type": "object"

src/apis/certificatemanager/v1.ts

@@ -183,7 +183,7 @@ export namespace certificatemanager_v1 {
      */
     pemCertificate?: string | null;
     /**
-     * Output only. The list of Subject Alternative Names of dnsName type defined in the certificate (see RFC 5280 4.2.1.6)
+     * Output only. The list of Subject Alternative Names of dnsName type defined in the certificate (see RFC 5280 4.2.1.6). Managed certificates that haven't been provisioned yet have this field populated with a value of the managed.domains field.
      */
     sanDnsnames?: string[] | null;
     /**
@@ -320,7 +320,7 @@ export namespace certificatemanager_v1 {
     type?: string | null;
   }
   /**
-   * A generic empty message that you can re-use to avoid defining duplicated empty messages in your APIs. A typical example is to use it as the request or the response type of an API method. For instance: service Foo { rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty); \} The JSON representation for `Empty` is empty JSON object `{\}`.
+   * A generic empty message that you can re-use to avoid defining duplicated empty messages in your APIs. A typical example is to use it as the request or the response type of an API method. For instance: service Foo { rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty); \}
    */
   export interface Schema$Empty {}
   /**