JDK-8297605 DelayQueue javadoc is confusing

[viktorklang-ora]

Clarifies the distinction between expiration of the head of DelayQueue and how it relates to poll, take, and peek. See discussion on https://bugs.openjdk.org/browse/JDK-8297605

@DougLea If possible, please weigh in on whether this is in line with your thoughts on the matter.

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Issue

• JDK-8297605: DelayQueue javadoc is confusing

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Webrevs

• 00: Full (2fb53b36)

[viktorklang-ora]

Reopening this as a new PR due to a weird validation error.