RFR: 8318180: Memory model reference from foreign package-info is broken

[Maurizio Cimadamore]

This PR fixes a wrong reference to the JLS memory model section.

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Commit messages:
 - Initial push

Changes: https://git.openjdk.org/jdk/pull/16204/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16204&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8318180
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/16204.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16204/head:pull/16204

PR: https://git.openjdk.org/jdk/pull/16204