Fix calls to contained()

Contained is a pure function, so the () was removed.

Author: odersky

doc-tool/test/dotty/tools/dottydoc/DottyDocTest.scala

@@ -54,7 +54,7 @@ trait DottyDocTest extends MessageRendering {
             System.err.println("reporter had errors:")
             ctx.reporter.removeBufferedMessages.foreach { msg =>
               System.err.println {
-                messageAndPos(msg.contained(), msg.pos, diagnosticLevel(msg))
+                messageAndPos(msg.contained, msg.pos, diagnosticLevel(msg))
               }
             }
           }

language-server/src/dotty/tools/languageserver/DottyLanguageServer.scala

@@ -709,7 +709,7 @@ object DottyLanguageServer {
         }
       }
 
-      val message = mc.contained()
+      val message = mc.contained
       if (displayMessage(message, mc.pos.source)) {
         val code = message.errorId.errorNumber.toString
         range(mc.pos).map(r =>