remove docgen remnants from repo, update CHANGELOG

pkg/pkg.status

 # Copyright (c) 2012, 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.
 
 # Don't run any test-like files that show up in packages directories. It
 # shouldn't be necessary to run "pub install" in these packages, but if you do
 # it shouldn't break the tests.
 */packages/*/*: Skip
 */*/packages/*/*: Skip
 */*/*/packages/*/*: Skip
 */*/*/*/packages/*/*: Skip
 */*/*/*/*/packages/*/*: Skip
 
 # Analyzer2dart is not maintained anymore.
 analyzer2dart/test/*: Skip
 
-[ $compiler != dartanalyzer && $compiler != dart2analyzer ]
-docgen/test/inherited_comments_test: Fail # issue 22233
-
 [ $compiler == none && ($runtime == drt || $runtime == dartium || $runtime == ContentShellOnAndroid) ]
 mutation_observer: Skip # Issue 21149
 unittest/*: Skip # Issue 21949
 lookup_map/*: SkipByDesign
 
 [ $runtime == vm && $mode == debug]
 analysis_server/test/analysis_server_test: SkipSlow  # Times out
 analysis_server/test/completion_test: SkipSlow  # Times out
 analysis_server/test/domain_context_test: SkipSlow  # Times out
 analysis_server/test/domain_server_test: SkipSlow  # Times out
 analysis_server/test/integration/*: SkipSlow # Times out
 analysis_server/tool/spec/check_all_test: SkipSlow # Times out
 analyzer/test/generated/element_test: SkipSlow  # Times out
 analyzer/test/generated/parser_test: SkipSlow  # Times out
-docgen/test/*: SkipSlow
 
 [ $runtime == vm && $system == windows]
 analysis_server/test/analysis/get_errors_test: Skip # runtime error, Issue 22180
 
 [ $compiler == dart2js ]
 collection/test/equality_test/01: Fail # Issue 1533
 collection/test/equality_test/02: Fail # Issue 1533
 collection/test/equality_test/03: Fail # Issue 1533
 collection/test/equality_test/04: Fail # Issue 1533
 collection/test/equality_test/05: Fail # Issue 1533
 collection/test/equality_test/none: Pass, Fail # Issue 14348
-docgen/test/*: SkipSlow # Far too slow
 typed_data/test/typed_buffers_test/01: Fail # Not supporting Int64List, Uint64List.
 analyzer/test/generated/engine_test: SkipSlow
 analyzer/test/generated/static_type_warning_code_test: Pass, Slow
 analyzer/test/generated/compile_time_error_code_test: Pass, Slow
 
 analyzer/test/enum_test: Slow, Pass, Fail # Issue 21323
 analyzer/test/src/context/context_test: Pass, Timeout # dartbug.com/23658
 
 analysis_server/test/*: Skip # Issue 22161
 analysis_server/test/search/element_references_test: Pass, Slow
@@ skipping 85 matching lines @@
 crypto/test/sha256_test: Slow, Pass
 crypto/test/sha1_test: Slow, Pass
 
 [ $browser ]
 analyzer_cli/*: SkipByDesign # Uses dart:io.
 */test/analyzer_test: SkipByDesign # No need to run analysis tests on browser bots
 analysis_server/test/*: SkipByDesign # Uses dart:io.
 analysis_server/tool/spec/check_all_test: SkipByDesign # Uses dart:io.
 analyzer/test/*: SkipByDesign # Uses dart:io.
 analyzer2dart/*: SkipByDesign # Uses dart:io.
-docgen/test/*: SkipByDesign # Uses dart:io.
 http_server/test/*: Fail, OK # Uses dart:io.
 observe/test/transformer_test: Fail, OK # Uses dart:io.
 observe/test/unique_message_test: SkipByDesign  # Uses dart:io.
 
 [ $runtime == vm && ($arch == simarm64 || $arch == simarm || $arch == simarmv5te || $arch == simmips || $arch == armv5te) ]
 # Timeout. These are not unit tests. They do not run efficiently on our
 # simulator or low-end devices.
 *: Skip
 
 [ $runtime == vm ]
 # Skip tests on the VM if the package depends on dart:html
 mutation_observer: Skip
 
 [ $compiler == dart2js && $runtime == chrome && $system == macos ]
 third_party/di_tests/di_test: Pass, Slow # Issue 22896
 
 [ $use_repository_packages ]
 analyzer/test/*: PubGetError
 
 [ $compiler == dart2js && $cps_ir ]
 lookup_map/test/lookup_map_test: RuntimeError # $async$temp1.get$tests is not a function