RFR: 8278587: StringTokenizer(String, String, boolean) documentation bug [v2]

[Naoto Sato]

> This is a doc fix to `StringTokenizer`, where the original spec does not account for the delimiter's length in the case of a supplementary character. Corresponding CSR has been drafted: https://bugs.openjdk.java.net/browse/JDK-8278814

Naoto Sato has updated the pull request incrementally with one additional commit since the last revision:

  Reflects CSR comments.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/6836/files
  - new: https://git.openjdk.java.net/jdk/pull/6836/files/1fcb399d..45bb8396

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=6836&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=6836&range=00-01

  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6836.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6836/head:pull/6836

PR: https://git.openjdk.java.net/jdk/pull/6836