Fixing Object.hashCode documentation

[Jonas Konrad]

Hi,

https://bugs.openjdk.java.net/browse/JDK-6321873 has been idle since 
2005. http://hg.openjdk.java.net/jdk9/dev/jdk/rev/458adf31ad5b changed 
the wording somewhat (though I still don't think it's explicit enough in 
that OpenJDK does *not* use the address). Could you further improve the 
wording, or if you believe it is sufficient, close the jira bug?

Thank you,
- Jonas Konrad