Fix order of parameters in POD documentation

The documentation for log_check() had the parameters in the wrong
order.  Also while there, rename %parameters to %params to better
documentation for similar functions which use %params.  Backpatch
down to v14 where this was introduced.

Author: Daniel Gustafsson <[email protected]>
Reviewed-by: Michael Paquier <[email protected]>
Discussion: https://postgr.es/m/[email protected]
Backpatch-through: 14
(cherry picked from commit c5639196caf7f65e0f1a57124e2412ebc923ab3c)

Author: danielgustafsson

src/test/perl/PostgreSQL/Test/Cluster.pm

@@ -2704,7 +2704,7 @@ sub log_content
 
 =pod
 
-=item $node->log_check($offset, $test_name, %parameters)
+=item $node->log_check($test_name, $offset, %params)
 
 Check contents of server logs.