RFR: 8336462: ConcurrentSkipListSet Javadoc incorrectly warns about size method complexity [v2]

[Viktor Klang]

> Removes some of the old wording around the algorithmic complexity of ConcurrentSkipListSet::size() while still retaining the warning around the accuracy of the returned result.

Viktor Klang has updated the pull request incrementally with one additional commit since the last revision:

  Adding paragraph to ConcurrentSkipListSet::set

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Changes:
  - all: https://git.openjdk.org/jdk/pull/20388/files
  - new: https://git.openjdk.org/jdk/pull/20388/files/6240668b..c1e02242

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20388&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20388&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/20388.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20388/head:pull/20388

PR: https://git.openjdk.org/jdk/pull/20388