Fix spelling of the word successfully

Auto-generated via:
    git grep -l [Ss]uccesfully  | xargs sed -ri 's/([sS])uccesfully/\1uccessfully/g'

I noticed this when running kube-scheduler with --v4 and it is annoying.
Then manually reverted changed to the vendored bits.

pkg/controller/deployment/deployment_controller.go

@@ -637,7 +637,7 @@ func (dc *DeploymentController) syncDeployment(key string) error {
 			return err
 		}
 		// So far the cleanup policy was executed once a deployment was paused, scaled up/down, or it
-		// succesfully completed deploying a replica set. Decouple it from the strategies and have it
+		// successfully completed deploying a replica set. Decouple it from the strategies and have it
 		// run almost unconditionally - cleanupDeployment is safe by default.
 		dc.cleanupDeployment(oldRSs, d)
 	}