update to using jdk11 by default, except link to jdk10 javadocs;
sync @docRoot references in javadoc with upstream

8179592: Update tables in java.base to be HTML 5-friendly

8177789: fix collections framework links to point to java.util package doc

whitespace

this collection => this XXX

Placate doclint

<tt> -> {@code

Update Creative Commons license URL in legal notices

6370984: Core library typos 2006-01

doc fixes

doc fixes

<p> before <table>

doc fixes

Add table

Headers reference Creative Commons

Added docs for type params

Proofreading pass -- many minor adjustments

Improve PQ.remove; mention that Queues don't usually define equals, hashCode

Fixed tense of summary statements (Adds rather than add etc)

doccheck target now working with new version 1.2b2

Continued updates to explicit and inherited doc comments.
Consistency over remove(null)
Some inherited doc is still not right.

Significant doc updates:
 - inherit comments where appropriate
 - ensure runtime exception comments inherited (overriding as needed)
 - consistent descriptions
 - introduce head and tail terminology

Partial javadoc pass

Documentation fixups

Copied Queue, AbstractQueue, and PriorityQueue from src/dl,
fixed some type parameterization, and added some basic tests.
Added control for -warnunchecked in user properties file.