RFR: 5709: Improve Biased lock revocation result text

[Jean-Philippe Bempel]

Improved explanation, stressing that the application is halted during revocation and explaining what are biased locking and revocation

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Commit messages:
 - 5709: Improve Biased lock revocation result text

Changes: https://git.openjdk.java.net/jmc/pull/144/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=144&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-5709
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jmc/pull/144.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/144/head:pull/144

PR: https://git.openjdk.java.net/jmc/pull/144