pgsql: Remove duplicate: < * Allow a warm standby system to also allow

Log Message:
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Remove duplicate:

< * Allow a warm standby system to also allow read-only queries

Modified Files:
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pgsql/doc:
TODO (r1.1472 -> r1.1473)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/TODO.diff?r1=1.1472&amp;r2=1.1473)