Improve wording of to_char() change in 8.1:
Improve wording of to_char() change in 8.1:

      The 8.1 release will remove the <function>to_char()</> function
      for intervals.

chrishajas/gpdb,atris/gpdb,lpetrov-pivotal/gpdb,edespino/gpdb,janebeckman/gpdb,foyzur/gpdb,lisakowen/gpdb,foyzur/gpdb,atris/gpdb,xinzweb/gpdb,rvs/gpdb,zaksoup/gpdb,lisakowen/gpdb,rubikloud/gpdb,jmcatamney/gpdb,ahachete/gpdb,tangp3/gpdb,janebeckman/gpdb,kaknikhil/gpdb,rvs/gpdb,50wu/gpdb,greenplum-db/gpdb,Quikling/gpdb,rubikloud/gpdb,foyzur/gpdb,xuegang/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,zeroae/postgres-xl,oberstet/postgres-xl,Quikling/gpdb,yazun/postgres-xl,adam8157/gpdb,zaksoup/gpdb,foyzur/gpdb,rubikloud/gpdb,lisakowen/gpdb,zaksoup/gpdb,royc1/gpdb,zaksoup/gpdb,edespino/gpdb,janebeckman/gpdb,Quikling/gpdb,yazun/postgres-xl,xinzweb/gpdb,kaknikhil/gpdb,pavanvd/postgres-xl,edespino/gpdb,arcivanov/postgres-xl,royc1/gpdb,randomtask1155/gpdb,yuanzhao/gpdb,jmcatamney/gpdb,Quikling/gpdb,jmcatamney/gpdb,royc1/gpdb,yuanzhao/gpdb,royc1/gpdb,CraigHarris/gpdb,ashwinstar/gpdb,rvs/gpdb,tpostgres-projects/tPostgres,techdragon/Postgres-XL,xuegang/gpdb,lisakowen/gpdb,kaknikhil/gpdb,kaknikhil/gpdb,cjcjameson/gpdb,Chibin/gpdb,yuanzhao/gpdb,adam8157/gpdb,foyzur/gpdb,rubikloud/gpdb,rvs/gpdb,rubikloud/gpdb,greenplum-db/gpdb,tangp3/gpdb,royc1/gpdb,ashwinstar/gpdb,50wu/gpdb,lpetrov-pivotal/gpdb,adam8157/gpdb,Postgres-XL/Postgres-XL,lpetrov-pivotal/gpdb,oberstet/postgres-xl,jmcatamney/gpdb,Quikling/gpdb,tangp3/gpdb,lintzc/gpdb,edespino/gpdb,0x0FFF/gpdb,50wu/gpdb,ovr/postgres-xl,atris/gpdb,kaknikhil/gpdb,rvs/gpdb,jmcatamney/gpdb,xinzweb/gpdb,techdragon/Postgres-XL,zeroae/postgres-xl,postmind-net/postgres-xl,50wu/gpdb,lintzc/gpdb,cjcjameson/gpdb,zaksoup/gpdb,postmind-net/postgres-xl,janebeckman/gpdb,kaknikhil/gpdb,edespino/gpdb,kmjungersen/PostgresXL,postmind-net/postgres-xl,Quikling/gpdb,tpostgres-projects/tPostgres,royc1/gpdb,pavanvd/postgres-xl,0x0FFF/gpdb,ahachete/gpdb,greenplum-db/gpdb,CraigHarris/gpdb,tangp3/gpdb,janebeckman/gpdb,yazun/postgres-xl,ashwinstar/gpdb,chrishajas/gpdb,adam8157/gpdb,kmjungersen/PostgresXL,Chibin/gpdb,foyzur/gpdb,janebeckman/gpdb,oberstet/postgres-xl,Chibin/gpdb,arcivanov/postgres-xl,techdragon/Postgres-XL,0x0FFF/gpdb,rvs/gpdb,tpostgres-projects/tPostgres,Chibin/gpdb,foyzur/gpdb,xuegang/gpdb,Postgres-XL/Postgres-XL,yazun/postgres-xl,tangp3/gpdb,lisakowen/gpdb,tpostgres-projects/tPostgres,ovr/postgres-xl,0x0FFF/gpdb,jmcatamney/gpdb,rubikloud/gpdb,xinzweb/gpdb,rubikloud/gpdb,foyzur/gpdb,pavanvd/postgres-xl,techdragon/Postgres-XL,zeroae/postgres-xl,kaknikhil/gpdb,yuanzhao/gpdb,arcivanov/postgres-xl,cjcjameson/gpdb,edespino/gpdb,kmjungersen/PostgresXL,greenplum-db/gpdb,xuegang/gpdb,pavanvd/postgres-xl,tangp3/gpdb,arcivanov/postgres-xl,Chibin/gpdb,kmjungersen/PostgresXL,edespino/gpdb,lisakowen/gpdb,tangp3/gpdb,lintzc/gpdb,snaga/postgres-xl,lisakowen/gpdb,edespino/gpdb,ahachete/gpdb,Quikling/gpdb,Chibin/gpdb,lintzc/gpdb,chrishajas/gpdb,ovr/postgres-xl,CraigHarris/gpdb,0x0FFF/gpdb,50wu/gpdb,chrishajas/gpdb,greenplum-db/gpdb,cjcjameson/gpdb,lpetrov-pivotal/gpdb,CraigHarris/gpdb,Postgres-XL/Postgres-XL,snaga/postgres-xl,CraigHarris/gpdb,chrishajas/gpdb,ashwinstar/gpdb,Chibin/gpdb,xuegang/gpdb,snaga/postgres-xl,cjcjameson/gpdb,arcivanov/postgres-xl,ashwinstar/gpdb,0x0FFF/gpdb,yazun/postgres-xl,ahachete/gpdb,oberstet/postgres-xl,lpetrov-pivotal/gpdb,chrishajas/gpdb,cjcjameson/gpdb,lintzc/gpdb,ovr/postgres-xl,royc1/gpdb,0x0FFF/gpdb,yuanzhao/gpdb,tangp3/gpdb,randomtask1155/gpdb,lintzc/gpdb,jmcatamney/gpdb,techdragon/Postgres-XL,kaknikhil/gpdb,50wu/gpdb,randomtask1155/gpdb,lpetrov-pivotal/gpdb,kmjungersen/PostgresXL,lisakowen/gpdb,greenplum-db/gpdb,randomtask1155/gpdb,ashwinstar/gpdb,xuegang/gpdb,cjcjameson/gpdb,rvs/gpdb,ahachete/gpdb,atris/gpdb,xuegang/gpdb,atris/gpdb,Chibin/gpdb,postmind-net/postgres-xl,zaksoup/gpdb,lpetrov-pivotal/gpdb,chrishajas/gpdb,ahachete/gpdb,yuanzhao/gpdb,xinzweb/gpdb,jmcatamney/gpdb,rvs/gpdb,cjcjameson/gpdb,janebeckman/gpdb,oberstet/postgres-xl,janebeckman/gpdb,rvs/gpdb,CraigHarris/gpdb,arcivanov/postgres-xl,yuanzhao/gpdb,yuanzhao/gpdb,Chibin/gpdb,xuegang/gpdb,50wu/gpdb,Postgres-XL/Postgres-XL,Quikling/gpdb,adam8157/gpdb,Quikling/gpdb,tpostgres-projects/tPostgres,rvs/gpdb,kaknikhil/gpdb,randomtask1155/gpdb,zaksoup/gpdb,pavanvd/postgres-xl,randomtask1155/gpdb,randomtask1155/gpdb,Quikling/gpdb,snaga/postgres-xl,zaksoup/gpdb,royc1/gpdb,yuanzhao/gpdb,ashwinstar/gpdb,edespino/gpdb,lintzc/gpdb,cjcjameson/gpdb,chrishajas/gpdb,adam8157/gpdb,xuegang/gpdb,50wu/gpdb,ahachete/gpdb,xinzweb/gpdb,postmind-net/postgres-xl,randomtask1155/gpdb,atris/gpdb,Postgres-XL/Postgres-XL,zeroae/postgres-xl,0x0FFF/gpdb,kaknikhil/gpdb,janebeckman/gpdb,ahachete/gpdb,CraigHarris/gpdb,janebeckman/gpdb,CraigHarris/gpdb,lintzc/gpdb,rubikloud/gpdb,lintzc/gpdb,Chibin/gpdb,xinzweb/gpdb,adam8157/gpdb,CraigHarris/gpdb,greenplum-db/gpdb,xinzweb/gpdb,cjcjameson/gpdb,adam8157/gpdb,atris/gpdb,ovr/postgres-xl,lpetrov-pivotal/gpdb,atris/gpdb,zeroae/postgres-xl,yuanzhao/gpdb,edespino/gpdb,snaga/postgres-xl