Update documentation readme to include all project javadoc links
# Tablesaw Documentation
* [The Tornado Tutorial](https://jtablesaw.github.io/tablesaw/tutorial) A short tutorial using Tablesaw to analyze a Tornado dataset.
-* [Getting Started](https://jtablesaw.github.io/tablesaw/gettingstarted) If you haven't used Tablesaw, or are having trouble 'getting it', you should start here. It covers most everything you need to begin using it productively.
+* [Getting Started](https://jtablesaw.github.io/tablesaw/gettingstarted) If you haven't used Tablesaw, you should start here. It covers what you need to begin using it productively.
* [User Guide](https://jtablesaw.github.io/tablesaw/userguide/toc) An in-depth guide to much of Tablesaw's functionality.
-* [Javadoc](http://www.javadoc.io/doc/tech.tablesaw/tablesaw-core/)
+* JavaDoc for Tablesaw projects:
+ * [Core](http://www.javadoc.io/doc/tech.tablesaw/tablesaw-core/)
+ * [Beakerx notebook support](http://www.javadoc.io/doc/tech.tablesaw/tablesaw-beakerx/)
+ * [Excel IO](http://www.javadoc.io/doc/tech.tablesaw/tablesaw-excel/)
+ * [HTML IO](http://www.javadoc.io/doc/tech.tablesaw/tablesaw-html/)
+ * [JSON IO](http://www.javadoc.io/doc/tech.tablesaw/tablesaw-json/)
+ * [JS-Plot Visualization](http://www.javadoc.io/doc/tech.tablesaw/tablesaw-jsplot/)
* [Contributor's Guide](https://jtablesaw.github.io/tablesaw/contributing) We welcome contributions! Here's how.
* [Release Notes](https://github.com/jtablesaw/tablesaw/releases)
Can't find what you're looking for?
-Ask your questions on the project [Issues page](https://github.com/jtablesaw/tablesaw/issues)
+Ask your questions on the [Discussions page](https://github.com/jtablesaw/tablesaw/discussions)
