pgsql: Convert some mulit-line comments in copy.c to single line, as

Log Message:
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Convert some mulit-line comments in copy.c to single line, as appropriate.

Modified Files:
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pgsql/src/backend/commands:
copy.c (r1.241 -> r1.242)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/copy.c.diff?r1=1.241&r2=1.242)