RFR: 8268573: Remove expired flags in JDK 19

[David Holmes]

Please review this simple change to remove all the flags that expired in JDK 19 from the flag table in arguments.cpp.

The java manpage is also updated as the UseBiasedLocking flag is moved from the "obsoleted" section, to the "removed" section. Plus we update the list of previous release docs.

Testing: local - all the runtime/CommandLine tests

Thanks,
David

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Commit messages:
 - 8268573: Remove expired flags in JDK 19

Changes: https://git.openjdk.java.net/jdk/pull/6819/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6819&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268573
  Stats: 29 lines in 2 files changed: 11 ins; 17 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6819.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6819/head:pull/6819

PR: https://git.openjdk.java.net/jdk/pull/6819