RFR: docs/build JDK-8223663 Update links for tool guides

[Alan Bateman]

On 18/05/2019 01:16, Jonathan Gibbons wrote:
> In JDK 13, the pages for the Tools Reference guides are moving, and so 
> the links from the API pages to these guides needs to be updated.
>
> Please review a two-part change.
I went changes to each of the module-info.java files and skimmed through 
the code for the new taglet. All looks good to me.

-Alan