[site24x7_amazon_monitor] Attributes are documented incorrectly

[dhoppe]

Without the attribute aws_discover_services the Site24x7 Amazon Monitor cannot be created and fails with an unrelated error message.

╷
│ Error: External ID has been expired, kindly refresh the page and try again
│
│   with module.site24x7_amazon_monitor.site24x7_amazon_monitor.this,
│   on .terraform/modules/site24x7_amazon_monitor/main.tf line 11, in resource "site24x7_amazon_monitor" "this":
│   11: resource "site24x7_amazon_monitor" "this" {
│
╵

I already create a pull request to fix the documentation. https://github.com/site24x7/terraform-provider-site24x7/pull/304