Fix hooks documentation typo
Fix hooks documentation typo

kaedroho/wagtail,gasman/wagtail,timorieber/wagtail,torchbox/wagtail,kaedroho/wagtail,mixxorz/wagtail,wagtail/wagtail,takeflight/wagtail,gasman/wagtail,thenewguy/wagtail,takeflight/wagtail,thenewguy/wagtail,mixxorz/wagtail,rsalmaso/wagtail,wagtail/wagtail,mikedingjan/wagtail,rsalmaso/wagtail,gasman/wagtail,kaedroho/wagtail,zerolab/wagtail,nealtodd/wagtail,rsalmaso/wagtail,mixxorz/wagtail,thenewguy/wagtail,kaedroho/wagtail,mixxorz/wagtail,FlipperPA/wagtail,jnns/wagtail,mixxorz/wagtail,nealtodd/wagtail,timorieber/wagtail,rsalmaso/wagtail,FlipperPA/wagtail,wagtail/wagtail,takeflight/wagtail,mikedingjan/wagtail,FlipperPA/wagtail,rsalmaso/wagtail,nimasmi/wagtail,kaedroho/wagtail,gasman/wagtail,zerolab/wagtail,timorieber/wagtail,mikedingjan/wagtail,thenewguy/wagtail,nimasmi/wagtail,zerolab/wagtail,jnns/wagtail,thenewguy/wagtail,wagtail/wagtail,jnns/wagtail,takeflight/wagtail,mikedingjan/wagtail,nealtodd/wagtail,gasman/wagtail,zerolab/wagtail,torchbox/wagtail,zerolab/wagtail,torchbox/wagtail,nimasmi/wagtail,torchbox/wagtail,nimasmi/wagtail,nealtodd/wagtail,wagtail/wagtail,timorieber/wagtail,jnns/wagtail,FlipperPA/wagtail