pgsql: Change path in example of file_fdw for logs

Change path in example of file_fdw for logs It's better to use a relative path into the data directory, than to a hardcoded home directory of user 'josh'. Discussion: https://postgr.es/m/CABUevEyuf67Yu_r9gpDMs5MKifK7+-+pe=zjkzya4jen9ku...@mail.gmail.com Branch -- REL_13_STABLE Details

pgsql: Change path in example of file_fdw for logs

Change path in example of file_fdw for logs It's better to use a relative path into the data directory, than to a hardcoded home directory of user 'josh'. Discussion: https://postgr.es/m/CABUevEyuf67Yu_r9gpDMs5MKifK7+-+pe=zjkzya4jen9ku...@mail.gmail.com Branch -- master Details --- htt