Fix order of parameters in POD documentation

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 <daniel@yesql.se>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Discussion: https://postgr.es/m/9F503B5-32F2-45D7-A0AE-952879AD65F1@yesql.se
Backpatch-through: 14