RFR: JDK-8133773: clarify specification of Spliterator.tryAdvance [v2]

[Viktor Klang]

> Attempting to make the "at-most once" nature, of invoking the supplied action to tryAdvance, clearer in the JavaDoc.

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

  Update src/java.base/share/classes/java/util/Spliterator.java
  
  Co-authored-by: Paul Sandoz <paul.d.sandoz at googlemail.com>

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13860/files
  - new: https://git.openjdk.org/jdk/pull/13860/files/51d5a070..50f23a91

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13860&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13860&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/13860.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13860/head:pull/13860

PR: https://git.openjdk.org/jdk/pull/13860