fix: CHECK_UPDATE_URL comment (#8235)

docker/.env.example

@@ -75,7 +75,7 @@ INIT_PASSWORD=
 DEPLOY_ENV=PRODUCTION
 
 # Whether to enable the version check policy.
-# If set to empty, https://updates.dify.ai will not be called for version check.
+# If set to empty, https://updates.dify.ai will be called for version check.
 CHECK_UPDATE_URL=https://updates.dify.ai
 
 # Used to change the OpenAI base address, default is https://api.openai.com/v1.