Request Review: JDK-8181639 Add tool and services information to module summary

[Mandy Chung]

http://cr.openjdk.java.net/~mchung/jdk9/webrevs/8181639/webrev.00

Updated javadoc:
   http://cr.openjdk.java.net/~mchung/jdk9/webrevs/8181639/api/

This patch mainly adds @uses, @provides and description of providers and tools.  This uses description list “dl” to list “Providers”, “Specifications”, “Tool Guides” in JDK 9. In the future this can be converted to custom taglets.

Mandy