[COMMITTERS] pgsql: Add comment for multi-byte computation.

[Bruce Momjian]

Log Message:
-----------
Add comment for multi-byte computation.

Modified Files:
--------------
    pgsql/src/backend/parser:
        parse_expr.c (r1.182 -> r1.183)
        
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_expr.c.diff?r1=1.182&r2=1.183)

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