Prevent mismatches on members named md (#2526)

* Prevent mismatches on members name md

* Minor fixes in spacing and indentation

Author: Varunram

doc-tool/src/dotty/tools/dottydoc/staticsite/MarkdownLinkVisitor.scala

@@ -7,15 +7,28 @@ import com.vladsch.flexmark.util.sequence.CharSubSequence
 import model.{ Package, NonEntity, Val, Def, TypeAlias }
 import dottydoc.util.MemberLookup
 
+import dotty.tools.dotc.core.Contexts.Context
+import dotty.tools.dotc.core.Decorators._
+
 object MarkdownLinkVisitor {
   private val EntityLink = """([^\.]+)(\.[^\.]+)*""".r
-  def apply(node: Node, docs: Map[String, Package], params: Map[String, AnyRef]): Unit =
+  def apply(node: Node, docs: Map[String, Package], params: Map[String, AnyRef])(implicit ctx: Context): Unit =
     (new NodeVisitor(
       new VisitHandler(classOf[Link], new Visitor[Link] with MemberLookup {
         override def visit(node: Link): Unit = {
           val url = node.getUrl
-          if (url.endsWith(".md")) node.setUrl {
-            url.subSequence(0, url.lastIndexOf('.')).append(".html")
+
+          if (url.endsWith(".md")) {
+            if (url.subSequence(0, url.lastIndexOf('.')).indexOf("/") < 0) {
+              val method = url.subSequence(0, url.lastIndexOf('.')).toString.toTypeName
+              if (ctx.getClassIfDefined(method).exists) node.setUrl {
+                url.subSequence(0, url.lastIndexOf('.')).append(".html")
+              } else {
+                ctx.error(s"""Ambiguous reference to "$url"""")
+              }
+            } else node.setUrl {
+              url.subSequence(0, url.lastIndexOf('.')).append(".html")
+            }
           }
           else if (EntityLink.unapplySeq(url.toString).isDefined) {
             lookup(NonEntity, docs, url.toString).foreach { ent =>