RFR: CODETOOLS-7903102: Remove obsolete traces of references to JavaHelp [v2]

[Jonathan Gibbons]

> Please review a build-only fix to remove obsolete references to the old JavaHelp system, which was removed back in 2016. [CODETOOLS-7901673](https://bugs.openjdk.java.net/browse/CODETOOLS-7901673)

Jonathan Gibbons has updated the pull request incrementally with one additional commit since the last revision:

  replace missing separators
  update copyrights

-------------

Changes:
  - all: https://git.openjdk.java.net/jtreg/pull/58/files
  - new: https://git.openjdk.java.net/jtreg/pull/58/files/8cbec5e5..bc77aa4c

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jtreg&pr=58&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jtreg&pr=58&range=00-01

  Stats: 25 lines in 23 files changed: 0 ins; 0 del; 25 mod
  Patch: https://git.openjdk.java.net/jtreg/pull/58.diff
  Fetch: git fetch https://git.openjdk.java.net/jtreg pull/58/head:pull/58

PR: https://git.openjdk.java.net/jtreg/pull/58