Documentation update of wal_retrieve_retry_interval to mention table sync worker

Hi,

Currently, we restart the table synchronization worker after the
duration specified by wal_retrieve_retry_interval following the last
failure. While this behavior is documented for apply workers, it is
not mentioned for table synchronization workers. I believe this detail
should be included in the documentation for table synchronization
workers as well. Attached is a patch to address this omission.

Regards,
Vignesh