doc: fix ALTER DOMAIN domain_constraint to spell out options

Fix parallel worker tracking of new catalog relfilenumbers.

Restore relmapper state early enough in parallel workers.

Clean up handling of client_encoding GUC in parallel workers.

Allow parallel workers to cope with a newly-created session user ID.

Avoid failure to open dropped detached partition

Fix creation of partition descriptor during concurrent detach+drop

docs: fix incorrect plpgsql error message

Improve ALTER PUBLICATION validation and error messages

Restructure foreign key handling code for ATTACH/DETACH

Refuse ATTACH of a table referenced by a foreign key

Doc: minor improvements for plpgsql "Transaction Management" section.

doc: Consistently use result set in documentation

Doc: fix misleading syntax synopses for targetlists.

Fix a missing article in the documentation

Reset relhassubclass upon attaching table as a partition