cloud: fix instructions to install the review tool
cloud: fix instructions to install the review tool

Change-Id: I0ac00f93fe252c84bc4feae86b95c31c43714e1b

ptomasroos/gcloud-golang,googleapis/google-cloud-go,googleapis/google-cloud-go,michael-grosshans/google-cloud-go,hsinhoyeh/gcloud-golang,ptomasroos/gcloud-golang,Maksadbek/gcloud-golang,blowmage/gcloud-golang,Maksadbek/gcloud-golang,roth1002/gcloud-golang,hsinhoyeh/gcloud-golang,roth1002/gcloud-golang,googleapis/google-cloud-go,blowmage/gcloud-golang,michael-grosshans/google-cloud-go,googleapis/google-cloud-go