RFR: 8320860: add-opens/add-exports require '=' in JAVA_TOOL_OPTIONS

[David Holmes]

Please review this simple clarification to the JVM TI spec regarding use of `JAVA_TOOL_OPTIONS` in regards to module options and their format.

I do not believe this clarification needs a CSR request.

Thanks.

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Commit messages:
 - 8320860: add-opens/add-exports require '=' in JAVA_TOOL_OPTIONS

Changes: https://git.openjdk.org/jdk/pull/16896/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16896&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8320860
  Stats: 4 lines in 1 file changed: 3 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/16896.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16896/head:pull/16896

PR: https://git.openjdk.org/jdk/pull/16896