RFR: 8181825: Add tool and services information to module summary

[Jonathan Gibbons]

On 6/8/17 8:57 PM, Robert Field wrote:
> A link is added for the new Tool Reference (“Tool Guides”), which great, though it should be “Tool Reference”.

Neither term is fully accurate, and we have been discussing better text 
with the Docs team..  For now, I opted for consistency with the updates 
in the jdk/ repo;  if necessary, we can/should do a forest-wide update 
for all such references.