doc: Improve markup

doc/src/sgml/ref/alter_table.sgml

@@ -722,7 +722,7 @@ ALTER TABLE [ IF EXISTS ] <replaceable class="PARAMETER">name</replaceable>
    </varlistentry>
 
    <varlistentry>
-    <term><literal>ATTACH PARTITION</literal> <replaceable class="PARAMETER">partition_name</replaceable> FOR VALUES <replaceable class="PARAMETER">partition_bound_spec</replaceable></term>
+    <term><literal>ATTACH PARTITION <replaceable class="PARAMETER">partition_name</replaceable> FOR VALUES <replaceable class="PARAMETER">partition_bound_spec</replaceable></literal></term>
     <listitem>
      <para>
       This form attaches an existing table (which might itself be partitioned)

doc/src/sgml/ref/create_table.sgml

@@ -248,7 +248,7 @@ CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } | UNLOGGED ] TABLE [ IF NOT EXI
    </varlistentry>
 
    <varlistentry>
-    <term><literal>PARTITION OF <replaceable class="PARAMETER">parent_table</replaceable></literal> FOR VALUES <replaceable class="PARAMETER">partition_bound_spec</replaceable></term>
+    <term><literal>PARTITION OF <replaceable class="PARAMETER">parent_table</replaceable> FOR VALUES <replaceable class="PARAMETER">partition_bound_spec</replaceable></literal></term>
     <listitem>
      <para>
       Creates the table as <firstterm>partition</firstterm> of the specified