Changes:
* Removes several `[testenv="gold+"]` attributes from the docs. `gold+` is not a valid [subscription level](https://www.elastic.co/subscriptions) or testenv value.
* Moves two `[testenv="basic"]` attributes to the file header. This makes the `testenv` placement consistent and fixes the yml file generated from `docs/reference/snapshot-restore/register-repository.asciidoc`.
Co-authored-by: James Rodewig <40268737+jrodewig@users.noreply.github.com>
* [DOCS] Promote cron expressions info from Watcher to a separate topic.
* Fix table error
* Fixed xref
* Apply suggestions from code review
Co-authored-by: James Rodewig <james.rodewig@elastic.co>
* Incorporated review feedback
Co-authored-by: James Rodewig <james.rodewig@elastic.co>
