[COMMITTERS] pgsql: Add comment about the use of EXEC_BACKEND.

Log Message:
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Add comment about the use of EXEC_BACKEND.

Modified Files:
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pgsql/src/backend/postmaster:
postmaster.c (r1.564 -> r1.565)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/postmaster/postmaster.c?r1=1.564&r2=1.565)

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