Update write-cache docs to mention windows behavior for various fsync_methods.
Update write-cache docs to mention windows behavior for various
fsync_methods.

Magnus.

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