Update docs that GNU tar versions >=1.16 exit with 1 on files changed, 2 on other errors.
Update docs that GNU tar versions >=1.16 exit with 1 on files changed, 2
on other errors.

Chibin/gpdb,greenplum-db/gpdb,Chibin/gpdb,Chibin/gpdb,50wu/gpdb,lintzc/gpdb,xuegang/gpdb,janebeckman/gpdb,edespino/gpdb,postmind-net/postgres-xl,janebeckman/gpdb,yuanzhao/gpdb,ashwinstar/gpdb,Chibin/gpdb,edespino/gpdb,CraigHarris/gpdb,Postgres-XL/Postgres-XL,zaksoup/gpdb,Quikling/gpdb,Quikling/gpdb,arcivanov/postgres-xl,Quikling/gpdb,edespino/gpdb,lintzc/gpdb,zaksoup/gpdb,0x0FFF/gpdb,postmind-net/postgres-xl,zaksoup/gpdb,lintzc/gpdb,chrishajas/gpdb,janebeckman/gpdb,ahachete/gpdb,lisakowen/gpdb,rvs/gpdb,xinzweb/gpdb,yuanzhao/gpdb,cjcjameson/gpdb,royc1/gpdb,royc1/gpdb,zaksoup/gpdb,50wu/gpdb,zaksoup/gpdb,kmjungersen/PostgresXL,xuegang/gpdb,Chibin/gpdb,kaknikhil/gpdb,rvs/gpdb,CraigHarris/gpdb,kaknikhil/gpdb,rvs/gpdb,janebeckman/gpdb,pavanvd/postgres-xl,edespino/gpdb,jmcatamney/gpdb,zeroae/postgres-xl,greenplum-db/gpdb,xuegang/gpdb,ashwinstar/gpdb,ahachete/gpdb,ahachete/gpdb,jmcatamney/gpdb,chrishajas/gpdb,kaknikhil/gpdb,chrishajas/gpdb,greenplum-db/gpdb,xuegang/gpdb,yuanzhao/gpdb,arcivanov/postgres-xl,50wu/gpdb,edespino/gpdb,zeroae/postgres-xl,yuanzhao/gpdb,jmcatamney/gpdb,cjcjameson/gpdb,janebeckman/gpdb,greenplum-db/gpdb,0x0FFF/gpdb,lisakowen/gpdb,chrishajas/gpdb,janebeckman/gpdb,kmjungersen/PostgresXL,ovr/postgres-xl,lintzc/gpdb,arcivanov/postgres-xl,yuanzhao/gpdb,ahachete/gpdb,jmcatamney/gpdb,edespino/gpdb,xuegang/gpdb,Quikling/gpdb,postmind-net/postgres-xl,yazun/postgres-xl,cjcjameson/gpdb,postmind-net/postgres-xl,greenplum-db/gpdb,snaga/postgres-xl,rvs/gpdb,cjcjameson/gpdb,oberstet/postgres-xl,kmjungersen/PostgresXL,kaknikhil/gpdb,xinzweb/gpdb,techdragon/Postgres-XL,techdragon/Postgres-XL,CraigHarris/gpdb,yazun/postgres-xl,Postgres-XL/Postgres-XL,tpostgres-projects/tPostgres,greenplum-db/gpdb,zaksoup/gpdb,yuanzhao/gpdb,ahachete/gpdb,oberstet/postgres-xl,ovr/postgres-xl,greenplum-db/gpdb,edespino/gpdb,ashwinstar/gpdb,ahachete/gpdb,50wu/gpdb,royc1/gpdb,edespino/gpdb,50wu/gpdb,CraigHarris/gpdb,yazun/postgres-xl,tpostgres-projects/tPostgres,royc1/gpdb,adam8157/gpdb,cjcjameson/gpdb,postmind-net/postgres-xl,lisakowen/gpdb,cjcjameson/gpdb,arcivanov/postgres-xl,xinzweb/gpdb,chrishajas/gpdb,xinzweb/gpdb,lisakowen/gpdb,ashwinstar/gpdb,pavanvd/postgres-xl,ashwinstar/gpdb,cjcjameson/gpdb,zeroae/postgres-xl,xuegang/gpdb,rvs/gpdb,adam8157/gpdb,tpostgres-projects/tPostgres,royc1/gpdb,lintzc/gpdb,adam8157/gpdb,royc1/gpdb,0x0FFF/gpdb,janebeckman/gpdb,tpostgres-projects/tPostgres,yuanzhao/gpdb,chrishajas/gpdb,janebeckman/gpdb,ashwinstar/gpdb,xinzweb/gpdb,Quikling/gpdb,xuegang/gpdb,royc1/gpdb,adam8157/gpdb,yazun/postgres-xl,zeroae/postgres-xl,edespino/gpdb,0x0FFF/gpdb,royc1/gpdb,jmcatamney/gpdb,yuanzhao/gpdb,lisakowen/gpdb,xinzweb/gpdb,greenplum-db/gpdb,zaksoup/gpdb,techdragon/Postgres-XL,Chibin/gpdb,snaga/postgres-xl,0x0FFF/gpdb,arcivanov/postgres-xl,rvs/gpdb,kaknikhil/gpdb,CraigHarris/gpdb,ovr/postgres-xl,pavanvd/postgres-xl,ahachete/gpdb,edespino/gpdb,kaknikhil/gpdb,Quikling/gpdb,chrishajas/gpdb,Quikling/gpdb,kaknikhil/gpdb,Postgres-XL/Postgres-XL,lintzc/gpdb,rvs/gpdb,CraigHarris/gpdb,Chibin/gpdb,snaga/postgres-xl,Chibin/gpdb,adam8157/gpdb,0x0FFF/gpdb,xinzweb/gpdb,kaknikhil/gpdb,chrishajas/gpdb,kmjungersen/PostgresXL,jmcatamney/gpdb,snaga/postgres-xl,zaksoup/gpdb,50wu/gpdb,CraigHarris/gpdb,ovr/postgres-xl,kmjungersen/PostgresXL,CraigHarris/gpdb,Quikling/gpdb,oberstet/postgres-xl,cjcjameson/gpdb,lisakowen/gpdb,pavanvd/postgres-xl,rvs/gpdb,yuanzhao/gpdb,Postgres-XL/Postgres-XL,adam8157/gpdb,janebeckman/gpdb,pavanvd/postgres-xl,yazun/postgres-xl,Chibin/gpdb,Quikling/gpdb,lintzc/gpdb,ashwinstar/gpdb,Chibin/gpdb,adam8157/gpdb,arcivanov/postgres-xl,jmcatamney/gpdb,zeroae/postgres-xl,ovr/postgres-xl,yuanzhao/gpdb,oberstet/postgres-xl,CraigHarris/gpdb,snaga/postgres-xl,ashwinstar/gpdb,cjcjameson/gpdb,lisakowen/gpdb,rvs/gpdb,50wu/gpdb,xuegang/gpdb,jmcatamney/gpdb,lisakowen/gpdb,tpostgres-projects/tPostgres,50wu/gpdb,kaknikhil/gpdb,techdragon/Postgres-XL,lintzc/gpdb,kaknikhil/gpdb,cjcjameson/gpdb,Postgres-XL/Postgres-XL,ahachete/gpdb,techdragon/Postgres-XL,rvs/gpdb,0x0FFF/gpdb,oberstet/postgres-xl,xuegang/gpdb,janebeckman/gpdb,0x0FFF/gpdb,lintzc/gpdb,adam8157/gpdb,Quikling/gpdb,xinzweb/gpdb