mtval.VALUE has Asciidoc showing up in Antora HTML view

[james-ball-qualcomm]

[dhower-qc]

I think this is caused by the fact that we're using the '+' continuation on the description to keep it together under the description list:

riscv-unified-db/backends/manual/templates/csr.adoc.erb

Line 127 in 00213d2

<%= arch_def.render_erb(field.description, "#{csr.name}.#{field.name}.description").gsub("\n", " +\n") %>

I changed to the continuation format because Asciidoc still doesn't have support for nested open blocks, and some descriptions have open blocks in them.

Perhaps we just need to move away from using a description list here.