Remove duplicated word in comment

Reviewed-by: Michael Paquier <michael@paquier.xyz>
Discussion: https://postgr.es/m/B7C15416-BD61-4926-9843-5C557BCD7007@yesql.se

src/test/recovery/t/013_crash_restart.pl

@@ -28,7 +28,7 @@ my $node = PostgreSQL::Test::Cluster->new('primary');
 $node->init(allows_streaming => 1);
 $node->start();
 
-# by default PostgreSQL::Test::Cluster doesn't doesn't restart after a crash
+# by default PostgreSQL::Test::Cluster doesn't restart after a crash
 $node->safe_psql(
 	'postgres',
 	q[ALTER SYSTEM SET restart_after_crash = 1;