Re: PGDOCS - Logical replication GUCs - added some xrefs

[Peter Eisentraut]

Your patch moves the description of the subscriber-related configuration 
parameters from config.sgml to logical-replication.sgml.  But 
config.sgml is supposed to contain *all* configuration parameters.  If 
we're going to start splitting this up and moving things around then 
we'd need a more comprehensive plan than this individual patch.  (I'm 
not suggesting that we actually do this.)