Labeled list indentation seems to have changed, and I'm not sure that it was an intentional change.
Previously, the list syntax [title]
always had a visual line break before the value, while title::
stayed on the same line. Now, the value always starts on the same line as the title.
From the RDoc::MarkupReference docs, here's how it renders in older darkfish:

And here's how it renders with the style changes in 6.8:

As a result, markup like this:
# [Parameters]
# - +input+ (String) RELAX NG schema definition
# - +options:+ (Nokogiri::XML::ParseOptions)
# Defaults to ParseOptions::DEFAULT_SCHEMA
which used to render well:

now renders oddly:

I'll take a look in the next few days, but wanted to capture what I'm seeing before I forget.