pkg/docgen: removed yaml and append output support

pkg/docgen/lib/docgen.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /// **docgen** is a tool for creating machine readable representations of Dart
 /// code metadata, including: classes, members, comments and annotations.
 ///
 /// docgen is run on a `.dart` file or a directory containing `.dart` files.
 ///
 ///      $ dart docgen.dart [OPTIONS] [FILE/DIR]
@@ skipping 20 matching lines @@
 /// also be documented.
 /// If [parseSdk] is `true`, then all Dart SDK libraries will be documented.
 /// This option is useful when only the SDK libraries are needed.
 /// If [compile] is `true`, then after generating the documents, compile the
 /// viewer with dart2js.
 /// If [serve] is `true`, then after generating the documents we fire up a
 /// simple server to view the documentation.
 ///
 /// Returned Future completes with true if document generation is successful.
 Future<bool> docgen(List<String> files, {String packageRoot,
-    bool outputToYaml: false, bool includePrivate: false,
-    bool includeSdk: false, bool parseSdk: false, bool append: false,
+    bool includePrivate: false, bool includeSdk: false, bool parseSdk: false,
     String introFileName: '', String out: gen.DEFAULT_OUTPUT_DIRECTORY,
     List<String> excludeLibraries: const [],
     bool includeDependentPackages: false, bool compile: false,
     bool serve: false, bool noDocs: false, String startPage, String pubScript,
     String dartBinary}) {
   var result;
   if (!noDocs) {
     viewer.ensureMovedViewerCode();
     result = gen.generateDocumentation(files, packageRoot: packageRoot,
-        outputToYaml: outputToYaml, includePrivate: includePrivate,
-        includeSdk: includeSdk, parseSdk: parseSdk, append: append,
+        includePrivate: includePrivate,
+        includeSdk: includeSdk, parseSdk: parseSdk,
         introFileName: introFileName, out: out,
         excludeLibraries: excludeLibraries,
         includeDependentPackages: includeDependentPackages,
         startPage: startPage, pubScript: pubScript, dartBinary: dartBinary);
     viewer.addBackViewerCode();
     if (compile || serve) {
       result.then((success) {
         if (success) {
           viewer.createViewer(serve);
         }
       });
     }
   } else if (compile || serve) {
     viewer.createViewer(serve);
   }
   return result;
 }