fix a typo in usage output

(cherry picked from commit e7c99e42)
14 jobs for fix-typo-v9_11 in 9 minutes and 31 seconds (queued for 6 seconds)
Status Job ID Name Coverage
  Precheck
passed #58306
amd64 docker linux
precheck:debian:sid:amd64

00:00:19

 
  Build
passed #58307
amd64 docker linux
build:centos:centos6:amd64

00:03:15

passed #58308
amd64 docker linux
build:centos:centos7:amd64

00:03:49

passed #58309
amd64 docker linux
build:debian:sid:amd64

00:02:46

passed #58310
i386 docker linux
build:debian:sid:i386

00:01:39

 
  Test
passed #58319
amd64 docker linux
install:debian:sid:amd64

00:03:10

passed #58315
amd64 docker linux
systemtest:centos:centos6:amd64

00:04:54

passed #58316
amd64 docker linux
systemtest:centos:centos7:amd64

00:05:00

passed #58317
amd64 docker linux
systemtest:debian:sid:amd64

00:05:06

passed #58318
i386 docker linux
systemtest:debian:sid:i386

00:05:18

passed #58311
amd64 docker linux
unittest:centos:centos6:amd64

00:01:09

passed #58312
amd64 docker linux
unittest:centos:centos7:amd64

00:01:14

passed #58313
amd64 docker linux
unittest:debian:sid:amd64

00:01:08

passed #58314
i386 docker linux
unittest:debian:sid:i386

00:01:05