Updated docs to describe approach for adding fieldsets to subclasses of PageAdmin.
Updated docs to describe approach for adding fieldsets to subclasses of PageAdmin.

SoLoHiC/mezzanine,douglaskastle/mezzanine,agepoly/mezzanine,webounty/mezzanine,industrydive/mezzanine,vladir/mezzanine,christianwgd/mezzanine,sjdines/mezzanine,Kniyl/mezzanine,agepoly/mezzanine,geodesign/mezzanine,dsanders11/mezzanine,jerivas/mezzanine,ryneeverett/mezzanine,readevalprint/mezzanine,agepoly/mezzanine,theclanks/mezzanine,webounty/mezzanine,dekomote/mezzanine-modeltranslation-backport,orlenko/plei,eino-makitalo/mezzanine,sjuxax/mezzanine,stephenmcd/mezzanine,dustinrb/mezzanine,adrian-the-git/mezzanine,eino-makitalo/mezzanine,christianwgd/mezzanine,scarcry/snm-mezzanine,vladir/mezzanine,orlenko/plei,wyzex/mezzanine,stephenmcd/mezzanine,Skytorn86/mezzanine,molokov/mezzanine,webounty/mezzanine,dovydas/mezzanine,sjdines/mezzanine,sjuxax/mezzanine,molokov/mezzanine,spookylukey/mezzanine,PegasusWang/mezzanine,damnfine/mezzanine,scarcry/snm-mezzanine,joshcartme/mezzanine,orlenko/sfpirg,wbtuomela/mezzanine,adrian-the-git/mezzanine,frankier/mezzanine,tuxinhang1989/mezzanine,gbosh/mezzanine,frankchin/mezzanine,emile2016/mezzanine,biomassives/mezzanine,batpad/mezzanine,nikolas/mezzanine,jjz/mezzanine,promil23/mezzanine,stephenmcd/mezzanine,Cajoline/mezzanine,vladir/mezzanine,Cajoline/mezzanine,industrydive/mezzanine,molokov/mezzanine,dustinrb/mezzanine,industrydive/mezzanine,theclanks/mezzanine,jjz/mezzanine,christianwgd/mezzanine,biomassives/mezzanine,emile2016/mezzanine,gradel/mezzanine,dovydas/mezzanine,ZeroXn/mezzanine,viaregio/mezzanine,stbarnabas/mezzanine,Cicero-Zhao/mezzanine,gradel/mezzanine,dsanders11/mezzanine,saintbird/mezzanine,guibernardino/mezzanine,AlexHill/mezzanine,fusionbox/mezzanine,spookylukey/mezzanine,promil23/mezzanine,cccs-web/mezzanine,AlexHill/mezzanine,tuxinhang1989/mezzanine,gbosh/mezzanine,PegasusWang/mezzanine,promil23/mezzanine,geodesign/mezzanine,biomassives/mezzanine,viaregio/mezzanine,damnfine/mezzanine,adrian-the-git/mezzanine,dekomote/mezzanine-modeltranslation-backport,Cajoline/mezzanine,emile2016/mezzanine,joshcartme/mezzanine,jjz/mezzanine,dustinrb/mezzanine,orlenko/sfpirg,gbosh/mezzanine,dekomote/mezzanine-modeltranslation-backport,dsanders11/mezzanine,saintbird/mezzanine,orlenko/sfpirg,sjuxax/mezzanine,douglaskastle/mezzanine,jerivas/mezzanine,mush42/mezzanine,ZeroXn/mezzanine,SoLoHiC/mezzanine,Kniyl/mezzanine,wyzex/mezzanine,SoLoHiC/mezzanine,ryneeverett/mezzanine,ryneeverett/mezzanine,viaregio/mezzanine,readevalprint/mezzanine,Skytorn86/mezzanine,saintbird/mezzanine,wbtuomela/mezzanine,guibernardino/mezzanine,Cicero-Zhao/mezzanine,wyzex/mezzanine,fusionbox/mezzanine,stbarnabas/mezzanine,scarcry/snm-mezzanine,wbtuomela/mezzanine,ZeroXn/mezzanine,gradel/mezzanine,frankier/mezzanine,orlenko/plei,nikolas/mezzanine,douglaskastle/mezzanine,wrwrwr/mezzanine,mush42/mezzanine,Kniyl/mezzanine,dovydas/mezzanine,sjdines/mezzanine,frankchin/mezzanine,geodesign/mezzanine,tuxinhang1989/mezzanine,wrwrwr/mezzanine,jerivas/mezzanine,joshcartme/mezzanine,nikolas/mezzanine,cccs-web/mezzanine,batpad/mezzanine,eino-makitalo/mezzanine,mush42/mezzanine,damnfine/mezzanine,Skytorn86/mezzanine,readevalprint/mezzanine,frankchin/mezzanine,PegasusWang/mezzanine,spookylukey/mezzanine,theclanks/mezzanine,frankier/mezzanine