Improve documentation of signal usage for HAVE_SIGPROCMASK and non-HAVE_SIGPROCMASK cases in pqinitmask().
Improve documentation of signal usage for HAVE_SIGPROCMASK and
non-HAVE_SIGPROCMASK cases in pqinitmask().

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