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ensime - "Scaladoc comments are indented according to the Scaladoc style guide".
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vim-scala refers to "the indentation standard as recommended for Scaladoc comments" and links to the guide.
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Intellij apparently uses "formatting for ScalaDoc2" in its UI.
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scalafmt has two options for indenting scaladoc: "ScalaDoc" and "JavaDoc".
In addition Twitter, Databricks and Spark style guides all refer to "ScalaDoc style", as does my employer's. Others don't mention it specifically but begin their guides "where unspecified, refer to the official guide". Oops, which one?