Log Message:-----------Clarify tar documentation about return error codes.
Backpatch to 8.2.X.
Modified Files:-------------- pgsql/doc/src/sgml: backup.sgml (r2.100 -> r2.101) (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/backup.sgml?r1=2.100&r2=2.101)
