[DOCS] doc change request (7.4.6, reference section, grant)

[Ralph Graulich]

Hi doc keepers,
while I was looking for which privilege is to be granted to a user so the 
user can lock tables, I found that information missing in the manual. 
Therefore I tried to add it to the sgml doc sources:

postgresql-7.4.6/doc/src/sgml/ref/grant.sgml
134c134,135
<        <function>setval</function> functions.
---
       <function>setval</function> functions. Also this privilege is
       required to be able to <literal>LOCK</literal> tables.
Best regards
... Ralph ...
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