fix settings.CONTEXT_PROCESSORS reference in docs
fix settings.CONTEXT_PROCESSORS reference in docs

caktus/rapidsms,ehealthafrica-ci/rapidsms,catalpainternational/rapidsms,eHealthAfrica/rapidsms,peterayeni/rapidsms,lsgunth/rapidsms,ehealthafrica-ci/rapidsms,lsgunth/rapidsms,peterayeni/rapidsms,lsgunth/rapidsms,lsgunth/rapidsms,catalpainternational/rapidsms,catalpainternational/rapidsms,eHealthAfrica/rapidsms,peterayeni/rapidsms,catalpainternational/rapidsms,ehealthafrica-ci/rapidsms,eHealthAfrica/rapidsms,caktus/rapidsms,caktus/rapidsms,peterayeni/rapidsms