chore: add description

Author: danpoletaev

apify-api/openapi/components/schemas/datasets/Dataset.yaml

@@ -71,9 +71,11 @@ properties:
     example: 'https://console.apify.com/storage/datasets/27TmTznX9YPeAYhkC'
   itemsPublicUrl:
     type: string
+    description: "A public link to access the dataset items directly."
     example: 'https://api.apify.com/v2/datasets/WkzbQMuFYuamGv3YF/items?signature=abc123'
   urlSigningSecretKey:
     type: string
+    description: "A secret key for generating signed public URLs. It is only provided to clients with WRITE permission for the dataset."
     nullable: true
   stats:
     $ref: ./DatasetStats.yaml

apify-api/openapi/components/schemas/key-value-stores/KeyValueStore.yaml

@@ -45,9 +45,11 @@ properties:
     example: 'https://console.apify.com/storage/key-value-stores/27TmTznX9YPeAYhkC'  
   keysPublicUrl:
     type: string
+    description: "A public link to access keys of the key-value store directly."
     example: 'https://api.apify.com/v2/key-value-stores/WkzbQMuFYuamGv3YF/keys?signature=abc123'
   urlSigningSecretKey:
     type: string
+    description: "A secret key for generating signed public URLs. It is only provided to clients with WRITE permission for the key-value store."
     nullable: true
   stats:
     $ref: ./KeyValueStoreStats.yaml

apify-api/openapi/components/schemas/key-value-stores/ListOfKeysResponse.yaml

@@ -24,6 +24,7 @@ properties:
           example: 36
         recordPublicUrl:
           type: string
+          description: "A public link to access this record directly."
           example: 'https://api.apify.com/v2/key-value-stores/WkzbQMuFYuamGv3YF/records/some-key?signature=abc123'
     description: ''
   count: