errata for Contributed-by

[Jonathan Gibbons]

http://openjdk.java.net/guide/producingChangeset.html#create lists this 
example for a changeset message:

1234567: NPE thrown on FileInputStream("")
Summary: Rewrite precondition-checking code in io.c
Reviewed-by: mr
Contributed-by: Ben Bitdiddle <ben at bits.org>

In practice, it seems jcheck requires a real email address. At any rate, 
it gave me
an unspecific "invalid contributor attribution" when I tried to follow 
the example.