Fix typo in code example. Fixes #1129
Fix typo in code example. Fixes #1129

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