[COMMITTERS] pgsql: Update URL to Ross William's paper.

Log Message:
-----------
Update URL to Ross William's paper.

Devrim Gunduz.

Modified Files:
--------------
pgsql/src/backend/utils/hash:
pg_crc.c (r1.19 -> r1.20)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/hash/pg_crc.c?r1=1.19&r2=1.20)

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