[4.1] Adjust asciidoc task to render the reference guide

[marko-bekhta]

> Task :documentation:renderReferenceDocumentation NO-SOURCE
file or directory '/home/marko/development/projects/opensource/hibernate-reactive/documentation/src/docs/asciidocRenderReferenceDocumentation', not found
file or directory '/home/marko/development/projects/opensource/hibernate-reactive/documentation/src/docs/asciidocRenderReferenceDocumentation', not found
Skipping task ':documentation:renderReferenceDocumentation' as it has no source files and no previous output files.

and then

Execution failed for task ':documentation:renderReferenceDocumentation'.
> Cannot fingerprint input property 'attributes': value '{docinfo=provider(?), do

for the 1st it seems the task is expecting a strange source location .. so lets be explicit ?
as for the second one, it seems that that map does not like any providers so we'd need to resolve the values when passing them to the map ...