pgsql-server: Minor documentation cleanup and improvement.

Log Message:
-----------
Minor documentation cleanup and improvement.

Modified Files:
--------------
    pgsql-server/doc/src/sgml/ref:
        create_operator.sgml (r1.42 -> r1.43)

(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/ref/create_operator.sgml.diff?r1=1.42&r2=1.43)
        deallocate.sgml (r1.5 -> r1.6)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/ref/deallocate.sgml.diff?r1=1.5&r2=1.6)
        drop_trigger.sgml (r1.18 -> r1.19)

(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/ref/drop_trigger.sgml.diff?r1=1.18&r2=1.19)
        execute.sgml (r1.10 -> r1.11)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/ref/execute.sgml.diff?r1=1.10&r2=1.11)
        postmaster.sgml (r1.51 -> r1.52)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/ref/postmaster.sgml.diff?r1=1.51&r2=1.52)
        prepare.sgml (r1.12 -> r1.13)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/ref/prepare.sgml.diff?r1=1.12&r2=1.13)
        rollback_to.sgml (r1.3 -> r1.4)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/ref/rollback_to.sgml.diff?r1=1.3&r2=1.4)
        savepoint.sgml (r1.2 -> r1.3)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/ref/savepoint.sgml.diff?r1=1.2&r2=1.3)
        set_transaction.sgml (r1.21 -> r1.22)

(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/ref/set_transaction.sgml.diff?r1=1.21&r2=1.22)
        start_transaction.sgml (r1.13 -> r1.14)

(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/ref/start_transaction.sgml.diff?r1=1.13&r2=1.14)