strict=true fails to change loglevel from Warning to Error

[st--]

With strict=true, Documenter errors when encountering an issue, but it doesn't actually say "Error" - only "Warning" - on the issue itself, which makes it non-intuitive to figure out what's going on (e.g. search log for error).

What happened: At the example of this docs build:

┌ Warning: no docs found for 'LaplaceApproximation' in `@docs` block in src/api/index.md:7-11
│ ```@docs
│ SparseVariationalApproximation
│ LaplaceApproximation
│ posterior
│ ```
└ @ Documenter.Expanders ~/.julia/packages/Documenter/qdbx6/src/Expanders.jl:336
(...)
ERROR: LoadError: `makedocs` encountered an error. Terminating build

What I would have expected (also based on looking into the source, e.g. loglevel in DocChecks.jl):
The first line should have read

┌ Error: no docs found for 'LaplaceApproximation' in `@docs` block in src/api/index.md:7-11

instead.