Document that retry_interval is only used after an active check result

[ekeih]

fixes #6795

[dnsmichi]

Imho this should link to the external check result docs, where this is explained deeper. At this point inside the table, the user doesn't need to know what exactly a soft state is.

https://icinga.com/docs/icinga2/latest/doc/08-advanced-topics/#external-check-results

[ekeih]

Thanks for the link. I was not aware that the behaviour is already explained there.
I linked to the "Check Result Freshness " chapter as the first paragraph explained everything #6795 was about: It is determined by the check_interval attribute and no incoming check results in that period of time.

[dnsmichi]

Fixed the anchor, thanks.