Update multiple-schedulers doc (#2063)

* Update tutorial

* Fix md formatting.

* Remove extraneous space

docs/admin/multiple-schedulers/my-scheduler.yaml

@@ -16,8 +16,11 @@ spec:
         version: second
     spec:
       containers:
-      - command: [/usr/local/bin/kube-scheduler, --address=0.0.0.0,
-                  --scheduler-name=my-scheduler, --leader-elect=false]
+      - command:
+        - /usr/local/bin/kube-scheduler
+        - --address=0.0.0.0
+        - --leader-elect=false
+        - --scheduler-name=my-scheduler
         image: gcr.io/my-gcp-project/my-kube-scheduler:1.0
         livenessProbe:
           httpGet:
@@ -37,4 +40,4 @@ spec:
         volumeMounts: []
       hostNetwork: false
       hostPID: false
-      volumes: []
+      volumes: []