Release type conditionals are not working in documentation

[scottfrederick]

The documentation Asciidoc source contains conditional statements for the release type, like:

ifeval::["{artifact-release-type}" == "release"]
...
endif::[]

and

ifeval::["{artifact-release-type}" != "snapshot"]
...
endif::[]

The artifact-release-type attribute does not appear to be set when docs are built, so the == conditions are never true and the != conditions are always true.

[izeye]

Given the changes are not in 3.2.9, this seems to have been assigned to a wrong milestone. It seems to belong to 3.3.3 milestone.