Remove badmerge in the scaladoc (#16752)

Author: Kordyjan

project/scripts/cmdScaladocTests

@@ -216,34 +216,6 @@ trait Resources(using ctx: DocContext) extends Locations, Writer:
           else renderPlain(s.head)
         case _ => ""
 
-    def docPartRenderPlain(d: DocPart): String =
-      import dotty.tools.scaladoc.tasty.comments.wiki._
-      import com.vladsch.flexmark.util.ast.{Node => MdNode}
-      def renderPlain(wd: WikiDocElement): String =
-        wd match
-          case Paragraph(text) => renderPlain(text)
-          case Chain(items) => items.map(renderPlain).mkString("")
-          case Italic(text) => renderPlain(text)
-          case Bold(text) => renderPlain(text)
-          case Underline(text) => renderPlain(text)
-          case Superscript(text) => renderPlain(text)
-          case Subscript(text) => renderPlain(text)
-          case Link(link, title) => title.map(renderPlain).getOrElse(
-            link match
-              case DocLink.ToURL(url) => url
-              case DocLink.ToDRI(_, name) => name
-              case _ => ""
-          )
-          case Monospace(text) => renderPlain(text)
-          case Text(text) => text
-          case Summary(text) => renderPlain(text)
-          case _ => ""
-      d match
-        case s: Seq[WikiDocElement @unchecked] =>
-          if s.length == 0 then ""
-          else renderPlain(s.head)
-        case _ => ""
-
     def processPage(page: Page, pageFQName: List[String]): Seq[(JSON, Seq[String])] =
       val (res, pageName) =  page.content match
         case m: Member if m.kind != Kind.RootPackage =>