RFR: 8339329: ConstantPoolBuilder#constantValueEntry method doc typo and clarifications [v3]

[David M. Lloyd]

> Please review this small documentation change to ConstantPoolBuilder to fix a typo and clarify the usage of the `constantValueEntry` method.

David M. Lloyd has updated the pull request incrementally with one additional commit since the last revision:

  Review feedback

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Changes:
  - all: https://git.openjdk.org/jdk/pull/20796/files
  - new: https://git.openjdk.org/jdk/pull/20796/files/03c0cc10..c95a0e2c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20796&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20796&range=01-02

  Stats: 7 lines in 3 files changed: 1 ins; 1 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/20796.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20796/head:pull/20796

PR: https://git.openjdk.org/jdk/pull/20796