doc: Fix up spacing around verbatim DocBook elements

doc/src/sgml/hstore.sgml

@@ -740,10 +740,10 @@ CREATE INDEX hidx ON testhstore USING GIN (h);
 
   <para>
    Example of creating such an index with a signature length of 32 bytes:
-  </para>
 <programlisting>
-  CREATE INDEX hidx ON testhstore USING GIST (h gist_hstore_ops(siglen=32));
+CREATE INDEX hidx ON testhstore USING GIST (h gist_hstore_ops(siglen=32));
 </programlisting>
+  </para>
 
   <para>
    <type>hstore</type> also supports <type>btree</type> or <type>hash</type> indexes for

doc/src/sgml/release-13.sgml

@@ -115,9 +115,9 @@ Author: Thomas Munro <tmunro@postgresql.org>
       old values to new ones can be done using:
      </para>
 
-    <programlisting>
+<programlisting>
-    SELECT round(sum(OLD / n::float)) FROM generate_series(1, OLD) s(n);
+SELECT round(sum(OLD / n::float)) FROM generate_series(1, OLD) s(n);
-    </programlisting>
+</programlisting>
     </listitem>
 
     <listitem>