fix(recommendationengine): update the API

#### recommendationengine:v1beta1

The following keys were changed:
- schemas.GoogleCloudRecommendationengineV1beta1UserInfo.properties.visitorId.description

discovery/recommendationengine-v1beta1.json

@@ -842,7 +842,7 @@
       }
     }
   },
-  "revision": "20210514",
+  "revision": "20210702",
   "rootUrl": "https://recommendationengine.googleapis.com/",
   "schemas": {
     "GoogleApiHttpBody": {
@@ -1949,7 +1949,7 @@
           "type": "string"
         },
         "visitorId": {
-          "description": "Required. A unique identifier for tracking visitors with a length limit of 128 bytes. For example, this could be implemented with a http cookie, which should be able to uniquely identify a visitor on a single device. This unique identifier should not change if the visitor log in/out of the website. Maximum length 128 bytes. Cannot be empty.",
+          "description": "Required. A unique identifier for tracking visitors with a length limit of 128 bytes. For example, this could be implemented with an HTTP cookie, which should be able to uniquely identify a visitor on a single device. This unique identifier should not change if the visitor logs in or out of the website. Maximum length 128 bytes. Cannot be empty.",
           "type": "string"
         }
       },

src/apis/recommendationengine/v1beta1.ts

@@ -943,7 +943,7 @@ export namespace recommendationengine_v1beta1 {
      */
     userId?: string | null;
     /**
-     * Required. A unique identifier for tracking visitors with a length limit of 128 bytes. For example, this could be implemented with a http cookie, which should be able to uniquely identify a visitor on a single device. This unique identifier should not change if the visitor log in/out of the website. Maximum length 128 bytes. Cannot be empty.
+     * Required. A unique identifier for tracking visitors with a length limit of 128 bytes. For example, this could be implemented with an HTTP cookie, which should be able to uniquely identify a visitor on a single device. This unique identifier should not change if the visitor logs in or out of the website. Maximum length 128 bytes. Cannot be empty.
      */
     visitorId?: string | null;
   }