JDK 9 RFR(s): 8177788 migrate collections docs into jdk doc-files

[Stuart Marks]

Hi all,

Please review this updated webrev [1] to migrate some collections 
technotes/guides into the JDK's javadoc doc-files.

This is an update of a webrev, previously reviewed. [2] In response to some 
comments from Mandy, I've removed the collections version history from this 
changeset. While I like having version history around, it does add clutter and 
more docs to keep maintained. I've also included some markup changes suggested 
by Brent Christian.

Thanks,

s'marks



[1] http://cr.openjdk.java.net/~smarks/reviews/8177788/webrev.1/

[2] http://mail.openjdk.java.net/pipermail/core-libs-dev/2017-April/047082.html