Issue Type: Documentation Request

Interactive Playground says:

JSDoc Tip: ..."using JSDoc comments... try this out by invoking the Book function"....

I have no idea what this means, or how to try it out.

The Interactive Playground doesn't not give steps, as it does for other features.

VS Code version: Code 1.32.3 (a3db5be, 2019-03-14T23:43:35.476Z)
OS version: Windows_NT x64 10.0.17763