387-Test coverage of getting IDs of CMS page/blocks by GraphQL API

Author: atwixfirster

app/code/Magento/CmsGraphQl/etc/schema.graphqls

@@ -12,7 +12,7 @@ type StoreConfig @doc(description: "The type contains information about a store
 
 type Query {
     cmsPage (
-        id: Int @doc(description: "Id of the CMS page") @deprecated(reason: "Use `identifier`") @doc(description: "The CMS page query returns information about a CMS page")
+        id: Int @doc(description: "Id of the CMS page") @deprecated(reason: "The `id` is deprecated. Use `identifier` instead.") @doc(description: "The CMS page query returns information about a CMS page")
         identifier: String @doc(description: "Identifier of the CMS page")
     ): CmsPage @resolver(class: "Magento\\CmsGraphQl\\Model\\Resolver\\Page") @doc(description: "The CMS page query returns information about a CMS page") @cache(cacheTag: "cms_p", cacheIdentity: "Magento\\CmsGraphQl\\Model\\Resolver\\Page\\Identity")
     cmsBlocks (