changeset comment Contributed-by: line

[John Coomes]

The description of the Contributed-by: line in

	http://openjdk.java.net/guide/producingChangeset.html

is simply:

	The contributed-by line is optional.

That doesn't provide much guidance.  Can someone update it to this (or
something similar)?

	The contributed-by line is optional; if present, it is a list
	of comma-separated email addresses.  It should be included
	only if the author of the code does not have commit rights to
	the target repository, and thus would not otherwise receive
	acknowledgement.

-John