RFR: 8315410: Undocumented exceptions in java.text.StringCharacterIterator [v2]

[Justin Lu]

> Please review this PR and [CSR](https://bugs.openjdk.org/browse/JDK-8315558) which is a conformance change to document some exceptions in the specification of java.text.StringCharacterIterator.

Justin Lu has updated the pull request incrementally with one additional commit since the last revision:

  Review: improve throws for setIndex

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15547/files
  - new: https://git.openjdk.org/jdk/pull/15547/files/a0582fdc..58c3f396

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15547&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15547&range=00-01

  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/15547.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15547/head:pull/15547

PR: https://git.openjdk.org/jdk/pull/15547