Use helper `raise_resource_not_available_error!` in GraphQL docs
What does this MR do and why?
Contributes to #409450 (comment 1378138128).
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
-
I have evaluated the MR acceptance checklist for this MR.
Edited by Peter Leitzen