Fix oversights in commit 8d5ceb113e

It added bogus whitespace at the end of a line in the documentation.
It should not have done that.

The pg_overexplain tests must SET debug_parallel_query = false,
not just RESET debug_parallel_query, or we get failures on test
machines that make debug_parallel_query = true the defualt.

contrib/pg_overexplain/expected/pg_overexplain.out

@@ -341,7 +341,7 @@ $$);
    Parse Location: 0 to end
 (37 rows)
 
-RESET debug_parallel_query;
+SET debug_parallel_query = false;
 RESET enable_seqscan;
 -- Test the DEBUG option with a non-SELECT query, and also verify that the
 -- hasReturning flag is shown.

contrib/pg_overexplain/sql/pg_overexplain.sql

@@ -67,7 +67,7 @@ SELECT explain_filter($$
 EXPLAIN (DEBUG, COSTS OFF)
 SELECT genus, array_agg(name ORDER BY name) FROM vegetables GROUP BY genus
 $$);
-RESET debug_parallel_query;
+SET debug_parallel_query = false;
 RESET enable_seqscan;
 
 -- Test the DEBUG option with a non-SELECT query, and also verify that the

doc/src/sgml/pgoverexplain.sgml

@@ -92,7 +92,7 @@
 
    <listitem>
     <para>
-     <literal>Subplans Needing Rewind</literal>. Integer IDs of subplans that 
+     <literal>Subplans Needing Rewind</literal>. Integer IDs of subplans that
      may need to be rewound by the executor.
     </para>
    </listitem>