RFR: 8344788: Specify that the access control context parameters of Subject.doAsPrivileged are ignored

[Sean Mullan]

Specify that the access control context parameters of `Subject.doAsPrivileged` are ignored. This spec update was missed as part of JEP 486.

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Commit messages:
 - Spec. updates.

Changes: https://git.openjdk.org/jdk/pull/22312/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22312&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344788
  Stats: 8 lines in 1 file changed: 0 ins; 2 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/22312.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22312/head:pull/22312

PR: https://git.openjdk.org/jdk/pull/22312