Fix nova.availability_zones docstring
Fix nova.availability_zones docstring

Change-Id: I66fe5cd5ab688bd4d3bedcdb79823497c65912e9

Juniper/nova,yrobla/nova,Triv90/Nova,maoy/zknova,LoHChina/nova,rahulunair/nova,viggates/nova,phenoxim/nova,cernops/nova,qwefi/nova,gspilio/nova,JioCloud/nova_test_latest,projectcalico/calico-nova,cloudbase/nova-virtualbox,vmturbo/nova,Triv90/Nova,citrix-openstack-build/nova,joker946/nova,Yuriy-Leonov/nova,vmturbo/nova,Yuriy-Leonov/nova,thomasem/nova,nikesh-mahalka/nova,angdraug/nova,DirectXMan12/nova-hacking,maoy/zknova,saleemjaveds/https-github.com-openstack-nova,barnsnake351/nova,belmiromoreira/nova,CiscoSystems/nova,jianghuaw/nova,orbitfp7/nova,CCI-MOC/nova,petrutlucian94/nova,JianyuWang/nova,maheshp/novatest,plumgrid/plumgrid-nova,eharney/nova,alvarolopez/nova,hanlind/nova,mmnelemane/nova,Francis-Liu/animated-broccoli,adelina-t/nova,DirectXMan12/nova-hacking,shahar-stratoscale/nova,Juniper/nova,cyx1231st/nova,akash1808/nova,whitepages/nova,tealover/nova,dims/nova,iuliat/nova,shootstar/novatest,shail2810/nova,maelnor/nova,sridevikoushik31/openstack,tealover/nova,openstack/nova,gspilio/nova,maoy/zknova,eonpatapon/nova,tangfeixiong/nova,CEG-FYP-OpenStack/scheduler,klmitch/nova,sebrandon1/nova,silenceli/nova,gooddata/openstack-nova,akash1808/nova_test_latest,zaina/nova,CloudServer/nova,mandeepdhami/nova,vladikr/nova_drafts,tanglei528/nova,watonyweng/nova,BeyondTheClouds/nova,jianghuaw/nova,petrutlucian94/nova,MountainWei/nova,TwinkleChawla/nova,rajalokan/nova,rajalokan/nova,devoid/nova,devendermishrajio/nova,eayunstack/nova,jeffrey4l/nova,shail2810/nova,bigswitch/nova,sridevikoushik31/openstack,devendermishrajio/nova_test_latest,leilihh/nova,JioCloud/nova,shahar-stratoscale/nova,gooddata/openstack-nova,blueboxgroup/nova,yosshy/nova,isyippee/nova,leilihh/nova,LoHChina/nova,eonpatapon/nova,rickerc/nova_audit,sridevikoushik31/nova,mgagne/nova,gspilio/nova,jeffrey4l/nova,yatinkumbhare/openstack-nova,Yusuke1987/openstack_template,CloudServer/nova,sridevikoushik31/openstack,mahak/nova,klmitch/nova,Brocade-OpenSource/OpenStack-DNRM-Nova,iuliat/nova,maheshp/novatest,citrix-openstack-build/nova,bgxavier/nova,plumgrid/plumgrid-nova,mahak/nova,spring-week-topos/nova-week,mgagne/nova,cernops/nova,Tehsmash/nova,sacharya/nova,jianghuaw/nova,nikesh-mahalka/nova,angdraug/nova,bclau/nova,JioCloud/nova_test_latest,alaski/nova,cyx1231st/nova,klmitch/nova,cloudbau/nova,double12gzh/nova,CEG-FYP-OpenStack/scheduler,mikalstill/nova,Tehsmash/nova,cloudbau/nova,apporc/nova,yrobla/nova,BeyondTheClouds/nova,CCI-MOC/nova,projectcalico/calico-nova,cernops/nova,OpenAcademy-OpenStack/nova-scheduler,rahulunair/nova,zaina/nova,JioCloud/nova,edulramirez/nova,felixma/nova,Metaswitch/calico-nova,redhat-openstack/nova,dstroppa/openstack-smartos-nova-grizzly,saleemjaveds/https-github.com-openstack-nova,felixma/nova,Triv90/Nova,luogangyi/bcec-nova,hanlind/nova,TwinkleChawla/nova,isyippee/nova,rajalokan/nova,mikalstill/nova,leilihh/novaha,Stavitsky/nova,alexandrucoman/vbox-nova-driver,DirectXMan12/nova-hacking,adelina-t/nova,gooddata/openstack-nova,ted-gould/nova,raildo/nova,watonyweng/nova,ntt-sic/nova,j-carpentier/nova,maelnor/nova,silenceli/nova,CiscoSystems/nova,Metaswitch/calico-nova,zhimin711/nova,openstack/nova,MountainWei/nova,ewindisch/nova,Francis-Liu/animated-broccoli,eayunstack/nova,varunarya10/nova_test_latest,edulramirez/nova,openstack/nova,vmturbo/nova,alvarolopez/nova,takeshineshiro/nova,sebrandon1/nova,raildo/nova,Juniper/nova,imsplitbit/nova,luogangyi/bcec-nova,akash1808/nova,gooddata/openstack-nova,phenoxim/nova,fnordahl/nova,mandeepdhami/nova,ntt-sic/nova,virtualopensystems/nova,bgxavier/nova,berrange/nova,dims/nova,scripnichenko/nova,blueboxgroup/nova,redhat-openstack/nova,dstroppa/openstack-smartos-nova-grizzly,affo/nova,dawnpower/nova,sridevikoushik31/nova,shootstar/novatest,zzicewind/nova,whitepages/nova,TieWei/nova,OpenAcademy-OpenStack/nova-scheduler,sebrandon1/nova,varunarya10/nova_test_latest,mikalstill/nova,cloudbase/nova,maheshp/novatest,devendermishrajio/nova_test_latest,barnsnake351/nova,badock/nova,rahulunair/nova,devendermishrajio/nova,ewindisch/nova,affo/nova,qwefi/nova,noironetworks/nova,bigswitch/nova,vladikr/nova_drafts,takeshineshiro/nova,zzicewind/nova,mmnelemane/nova,TieWei/nova,spring-week-topos/nova-week,yosshy/nova,SUSE-Cloud/nova,double12gzh/nova,Juniper/nova,ted-gould/nova,alaski/nova,BeyondTheClouds/nova,thomasem/nova,kimjaejoong/nova,rrader/nova-docker-plugin,virtualopensystems/nova,scripnichenko/nova,imsplitbit/nova,j-carpentier/nova,tanglei528/nova,apporc/nova,zhimin711/nova,fnordahl/nova,Stavitsky/nova,hanlind/nova,belmiromoreira/nova,bclau/nova,petrutlucian94/nova_dev,yatinkumbhare/openstack-nova,SUSE-Cloud/nova,petrutlucian94/nova_dev,orbitfp7/nova,tudorvio/nova,jianghuaw/nova,dstroppa/openstack-smartos-nova-grizzly,mahak/nova,dawnpower/nova,sacharya/nova,viggates/nova,alexandrucoman/vbox-nova-driver,badock/nova,NeCTAR-RC/nova,ruslanloman/nova,ruslanloman/nova,rajalokan/nova,tudorvio/nova,berrange/nova,akash1808/nova_test_latest,cloudbase/nova,joker946/nova,cloudbase/nova-virtualbox,cloudbase/nova,leilihh/novaha,sridevikoushik31/nova,kimjaejoong/nova,rickerc/nova_audit,tianweizhang/nova,tianweizhang/nova,eharney/nova,NeCTAR-RC/nova,JianyuWang/nova,tangfeixiong/nova,klmitch/nova,vmturbo/nova,rrader/nova-docker-plugin,Brocade-OpenSource/OpenStack-DNRM-Nova,sridevikoushik31/nova,devoid/nova,noironetworks/nova,Yusuke1987/openstack_template,yrobla/nova