Update the pl/python shared build docs to match the recent version of python.
Update the pl/python shared build docs to match the recent version of
python.

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