Add `Page.parent_page_types` to the docs
Add `Page.parent_page_types` to the docs

darith27/wagtail,Tivix/wagtail,chrxr/wagtail,Toshakins/wagtail,quru/wagtail,gasman/wagtail,willcodefortea/wagtail,torchbox/wagtail,serzans/wagtail,rjsproxy/wagtail,rsalmaso/wagtail,m-sanders/wagtail,inonit/wagtail,dresiu/wagtail,gogobook/wagtail,janusnic/wagtail,WQuanfeng/wagtail,bjesus/wagtail,willcodefortea/wagtail,rsalmaso/wagtail,serzans/wagtail,Klaudit/wagtail,kurtrwall/wagtail,iansprice/wagtail,hamsterbacke23/wagtail,mayapurmedia/wagtail,stevenewey/wagtail,marctc/wagtail,timorieber/wagtail,nimasmi/wagtail,nutztherookie/wagtail,tangentlabs/wagtail,WQuanfeng/wagtail,nrsimha/wagtail,rjsproxy/wagtail,thenewguy/wagtail,bjesus/wagtail,timorieber/wagtail,hamsterbacke23/wagtail,JoshBarr/wagtail,kurtw/wagtail,mixxorz/wagtail,rjsproxy/wagtail,bjesus/wagtail,gogobook/wagtail,gasman/wagtail,mephizzle/wagtail,Pennebaker/wagtail,kurtrwall/wagtail,takeflight/wagtail,jnns/wagtail,benjaoming/wagtail,KimGlazebrook/wagtail-experiment,Pennebaker/wagtail,kaedroho/wagtail,nilnvoid/wagtail,Klaudit/wagtail,willcodefortea/wagtail,wagtail/wagtail,jorge-marques/wagtail,m-sanders/wagtail,nutztherookie/wagtail,timorieber/wagtail,mayapurmedia/wagtail,benemery/wagtail,WQuanfeng/wagtail,hamsterbacke23/wagtail,Pennebaker/wagtail,takeshineshiro/wagtail,taedori81/wagtail,zerolab/wagtail,wagtail/wagtail,takeshineshiro/wagtail,benemery/wagtail,nimasmi/wagtail,taedori81/wagtail,nealtodd/wagtail,iho/wagtail,nutztherookie/wagtail,benemery/wagtail,JoshBarr/wagtail,chimeno/wagtail,wagtail/wagtail,willcodefortea/wagtail,dresiu/wagtail,davecranwell/wagtail,quru/wagtail,marctc/wagtail,rsalmaso/wagtail,torchbox/wagtail,nrsimha/wagtail,iansprice/wagtail,nimasmi/wagtail,jnns/wagtail,quru/wagtail,chimeno/wagtail,nilnvoid/wagtail,serzans/wagtail,takeshineshiro/wagtail,zerolab/wagtail,gasman/wagtail,jordij/wagtail,davecranwell/wagtail,KimGlazebrook/wagtail-experiment,FlipperPA/wagtail,hanpama/wagtail,mayapurmedia/wagtail,iansprice/wagtail,tangentlabs/wagtail,nrsimha/wagtail,mjec/wagtail,inonit/wagtail,jorge-marques/wagtail,serzans/wagtail,nealtodd/wagtail,Toshakins/wagtail,davecranwell/wagtail,jorge-marques/wagtail,thenewguy/wagtail,gasman/wagtail,takeflight/wagtail,m-sanders/wagtail,mjec/wagtail,kaedroho/wagtail,mephizzle/wagtail,zerolab/wagtail,chimeno/wagtail,Tivix/wagtail,benemery/wagtail,zerolab/wagtail,hamsterbacke23/wagtail,mjec/wagtail,kurtrwall/wagtail,marctc/wagtail,chrxr/wagtail,tangentlabs/wagtail,thenewguy/wagtail,hanpama/wagtail,nilnvoid/wagtail,JoshBarr/wagtail,kaedroho/wagtail,taedori81/wagtail,gogobook/wagtail,rv816/wagtail,bjesus/wagtail,dresiu/wagtail,gasman/wagtail,jordij/wagtail,iho/wagtail,timorieber/wagtail,takeflight/wagtail,stevenewey/wagtail,stevenewey/wagtail,dresiu/wagtail,darith27/wagtail,benjaoming/wagtail,mephizzle/wagtail,kaedroho/wagtail,rsalmaso/wagtail,JoshBarr/wagtail,iho/wagtail,chrxr/wagtail,torchbox/wagtail,jordij/wagtail,inonit/wagtail,rv816/wagtail,iansprice/wagtail,stevenewey/wagtail,hanpama/wagtail,kurtw/wagtail,mixxorz/wagtail,jordij/wagtail,mixxorz/wagtail,janusnic/wagtail,davecranwell/wagtail,jorge-marques/wagtail,chimeno/wagtail,thenewguy/wagtail,dresiu/wagtail,KimGlazebrook/wagtail-experiment,mixxorz/wagtail,hanpama/wagtail,taedori81/wagtail,rv816/wagtail,mjec/wagtail,chrxr/wagtail,mikedingjan/wagtail,Klaudit/wagtail,janusnic/wagtail,FlipperPA/wagtail,jorge-marques/wagtail,tangentlabs/wagtail,torchbox/wagtail,nutztherookie/wagtail,nimasmi/wagtail,jnns/wagtail,takeshineshiro/wagtail,nealtodd/wagtail,gogobook/wagtail,quru/wagtail,rv816/wagtail,kurtw/wagtail,Toshakins/wagtail,inonit/wagtail,FlipperPA/wagtail,kurtw/wagtail,mixxorz/wagtail,Toshakins/wagtail,wagtail/wagtail,WQuanfeng/wagtail,iho/wagtail,mikedingjan/wagtail,chimeno/wagtail,m-sanders/wagtail,rsalmaso/wagtail,benjaoming/wagtail,rjsproxy/wagtail,darith27/wagtail,nealtodd/wagtail,mikedingjan/wagtail,wagtail/wagtail,zerolab/wagtail,mikedingjan/wagtail,nrsimha/wagtail,kaedroho/wagtail,Klaudit/wagtail,Pennebaker/wagtail,darith27/wagtail,kurtrwall/wagtail,mephizzle/wagtail,benjaoming/wagtail,janusnic/wagtail,taedori81/wagtail,Tivix/wagtail,FlipperPA/wagtail,jnns/wagtail,thenewguy/wagtail,takeflight/wagtail,mayapurmedia/wagtail,marctc/wagtail,nilnvoid/wagtail,Tivix/wagtail,KimGlazebrook/wagtail-experiment