Update EXECUTE docs to mention tag matches prepared statement.

Update log_statement to more clearly state it doesn't filter based on
the statement type of the prepared statement.

doc/src/sgml/ref/execute.sgml

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@@ -45,6 +45,8 @@ EXECUTE <replaceable class="PARAMETER">plan_name</replaceable> [ (<replaceable c
   </para>
 
   <para>
+   The command tag returned by <command>EXECUTE</command>
+   is that of the prepared statement, and not <literal>EXECUTE</>.
    For more information on the creation and usage of prepared statements,
    see <xref linkend="sql-prepare" endterm="sql-prepare-title">.
   </para>

doc/src/sgml/runtime.sgml

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 <Chapter Id="runtime">
@@ -2135,16 +2135,19 @@ SET ENABLE_SEQSCAN TO OFF;
         <literal>UPDATE</>, <literal>DELETE</>, <literal>TRUNCATE</>,
         and <literal>COPY FROM</>. <literal>PREPARE</> and
         <literal>EXPLAIN ANALYZE</> statements are also considered for
-        appropriate commands. The default is <literal>none</>. Only
-        superusers can reduce the detail of this option if it has been
-        set by an administrator.
+        appropriate commands. 
+       </para>
+       <para>
+        The default is <literal>none</>. Only superusers can reduce 
+        the detail of this option if it has been set by an administrator.
        </para>
 
        <note>
         <para>
-         When the <command>EXECUTE</command> statement is logged, only
-         the name of the prepared statement is recorded, not the
-         entire prepared statement.
+         The <command>EXECUTE</command> statement not considered a
+         <literal>ddl</> or <literal>mod</> statement.  When it is logged, 
+         only the name of the prepared statement is reported, not the
+         actual prepared statement.
         </para>
 
         <para>