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Doc: enhance pgbench manual.
Clarify the difference between "prepared mode" and other query modes. Discussion: https://postgr.es/m/20181030.103654.2249812451112831300.t-ishii@sraoss.co.jp Reviewed by: Fabien Coelh and Alvaro Herrera.
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doc/src/sgml/ref/pgbench.sgml

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@@ -473,6 +473,13 @@ pgbench <optional> <replaceable>options</replaceable> </optional> <replaceable>d
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<para><literal>prepared</literal>: use extended query protocol with prepared statements.</para>
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</listitem>
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</itemizedlist>
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Because in "prepared" mode <application>pgbench</application> reuses
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the parse analysis result for the second and subsequent query
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iteration, <application>pgbench</application> runs faster in the
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prepared mode than in other modes.
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</para>
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<para>
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The default is simple query protocol. (See <xref linkend="protocol"/>
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for more information.)
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</para>

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