content/flowcontrol.article: mention defer in the title
content/flowcontrol.article: mention defer in the title

Fixes golang/go#10620.

Change-Id: I52d6eddc6e59d1f7812117b0923a01f632d28d29
Reviewed-on: https://go-review.googlesource.com/9494
Reviewed-by: Francesc Campoy Flores <3149fa091f5edfa916be664d7a800f2d780f07b1@golang.org>

dupoxy/go-tour-fr,Jasperste/tour,Go-zh/tour,golians/tour,phoorichet/tour,bbandaru/tour,LaPingvino/go-tour-nl,scryner/tour,shuLhan/go-tour-id,tamnd/tour,shuLhan/tour,golians/tour,LaPingvino/go-tour-eo,bbandaru/tour,phoorichet/tour,shuLhan/tour,Go-zh/tour,shuLhan/go-tour-id,raindev/tour,campoy/go-tour-ua,dupoxy/go-tour-fr,raindev/tour,ybin/tour,tamnd/tour,ybin/tour,Jasperste/tour,LaPingvino/go-tour-nl,LaPingvino/go-tour-eo,Jasperste/tour,phoorichet/tour,campoy/go-tour-ua,shuLhan/tour,ybin/tour,Go-zh/tour,tamnd/tour,raindev/tour,scryner/tour,Go-zh/tour,dupoxy/go-tour-fr,zorion/go-tour-ca,scryner/tour,bbandaru/tour,golians/tour,LaPingvino/go-tour-nl,scryner/tour,LaPingvino/go-tour-eo,golang/tour,zorion/go-tour-ca,shuLhan/go-tour-id,campoy/go-tour-ua