Convert some passthrough XML comments left over from the DocBook →
AsciiDoc conversion to AsciiDoc / Asciidoctor comments.
Change-Id: Iaf44bcf0b8a3a383e735b2b4394722cbbb2bdff3
Reviewed-on: https://code.wireshark.org/review/25615
Reviewed-by: Gerald Combs <gerald@wireshark.org>