stray pipe in copy.sgml - Mailing list pgsql-docs

It seems there is a stray |  trailing behind the FORCE_NOT_NULL line here:

http://www.postgresql.org/docs/9.3/static/sql-copy.html

(in HEAD, 93, 92, 91), or at least, I fail to see its meaning.

Trivial patch attached.

Thanks,

Erikjan Rijkers