Thread: pgsql-server: Add more index entries for reference pages related to

Log Message:
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Add more index entries for reference pages related to prepare queries.
From Alvaro Herrera, editorializing by Neil Conway.

Modified Files:
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    pgsql-server/doc/src/sgml/ref:
        deallocate.sgml (r1.6 -> r1.7)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/ref/deallocate.sgml.diff?r1=1.6&r2=1.7)
        execute.sgml (r1.11 -> r1.12)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/ref/execute.sgml.diff?r1=1.11&r2=1.12)
        explain.sgml (r1.33 -> r1.34)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/ref/explain.sgml.diff?r1=1.33&r2=1.34)
        prepare.sgml (r1.13 -> r1.14)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/ref/prepare.sgml.diff?r1=1.13&r2=1.14)