Expose exported classes as well.

pkg/docgen/README.md

 docgen
 ======
 
 A documentation generator for Dart.
 - - -
 The docgen tool takes in a file or directory as input and produces documentation
 for all `.dart` file it finds as YAML or JSON files. This outputs information 
 about all classes, variables, functions, and methods defined in the library and 
 its imported libraries.
 
 ### Quick Start: Common Commands 
 
-While standing in the `bin` directory:
+##### To only generate documentation, while standing in the `bin` directory:
 
 `dartdoc.py` generates all documentation and runs a local server with your html
 pages.
 
 `dartdoc.py -d` ONLY generates documentation for the SDK and all packages (no
 html pages generated and no server).
 
 `dartdoc.py -d -o package/to/document` ONLY generates documenation for the
 specified package.
 
+##### To generate documentation and view it through the webpage:
+- Install [Google App Engine SDK for Python][GAE] (one time setup) and agree to
+   add symlinks so that dev\_appserver.py can be found on your PATH.
+- Run `dartdoc.py`.
+
 ### Generating files & uploading to Cloud Storage
 
 The viewer uses YAML files generated by the docgen package as the data 
 being displayed. These files are stored in Google Cloud Storage.
 
  - Run `python upload_docgen.py` to generate these files and upload them to 
  Cloud Storage as a new version.
 - - -
 These tasks can be done separately if necessary:
 
@@ skipping 18 matching lines @@
 - `--include-sdk` Flag to parse SDK Library files imported.
 - `--parse-sdk` Parses the SDK libraries only. (Ignores the path passed in.)
 - `--package-root` Sets the package root of the library being analyzed.
 - `--append` Appends to the docs folder, library_list.json, and index.txt.
 - `--introduction` Adds the provided markdown text file as the introduction
 for the outputted documentation.
 
 
 ###### Output directory
 Documented libraries will be located at bin/docs in either YAML or JSON format 
-depending on options specified. There will also be a library_list.json, 
+depending on options specified. There will also be a library\_list.json, 
 containing a list of all the libraries inside the docs folder. 
 
 To get more information on how to use the outputted documentation with 
 dartdoc-viewer, please take a look at the 
 [dartdoc-viewer documentation][dartdoc-viewer].
 
 #### Uploading to Cloud Storage
 
 To push new files to Google Cloud Storage for use by the viewer, use the 
 `gsutil` tool located at third_party/gsutil/gsutil in the Dart repository.
@@ skipping 50 matching lines @@
  (ex. `--options='--include-sdk files'`).
  2. The `--gae-sdk` option gives the absolute path to the 
  [Google App Engine SDK][GAE]. 
 
 Running `python dartdoc.py --options=<docgen options> --gae-sdk=<path to SDK>` 
 will serve files generated by `docgen.dart` in your browser.
 
 [dartdoc-viewer]: https://github.com/dart-lang/dartdoc-viewer "Dartdoc-Viewer"
 [GAE]: https://developers.google.com/appengine/downloads#Google_App_Engine_SDK_for_Python  "Google App Engine SDK for Python"