Rene Schakmann 23cdf8465c Clarify ConcurrentReferenceHashMap reference semantics
Prior to this commit, the Javadoc for ConcurrentReferenceHashMap
stated that soft or weak references are used for both keys and values.

However, the references are applied to the internal map entries, each
of which holds strong references to its key and value. Consequently,
an entry may be discarded even if its key and value are still strongly
reachable from elsewhere, which differs from the semantics of
WeakHashMap.

This commit revises the class-level Javadoc as well as the Javadoc for
the ReferenceType constants to document this behavior.

See gh-24253
Closes gh-37357

Signed-off-by: rene.schakmann <rene.schakmann@reetgroup.com>
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