Improve Biased lock revocation result text

BiasedLockingRevocationRule currently gives a pretty short result:

The total time spent revoking biased locks was 2 s. To avoid this, either turn off biased Locking ('-XX:-UseBiasedLocking') or, if this occurs during startup, delay the
use of biased Locking ('-XX:BiasedLockingStartupDelay').

We should explain what biased lock revocation means, why it happens, why the user should care about it, and if it can be avoided in some other way.