Replace list of oids for function arguments with more explicit list

[davidfetter]

Casting from oidvector to text produced a list of OIDs that seemed less helpful to the reader than what pg_catalog.pg_get_function_arguments produces, so use that.

[cbrianpace]

What versions of Postgres will this change be compatible with (how far back)?

[keithf4]

This function is available to all publicly supported versions of PG (12 -16) so should be good.

Thanks David!

[davidfetter]

Delighted to help!