docs: update readme

README.md

@@ -2,8 +2,8 @@
 DI Orchestrator is designed to manage DI (Decision Intelligence) jobs using Kubernetes Custom Resource and Operator. 
 
 ### Prerequisites
-- A well prepared kubernetes cluster. Follow the [instructions](https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm/) to create a kubernetes cluster, or create a local kubernetes node referring to [kind](https://kind.sigs.k8s.io/docs/user/quick-start/) or [minikube](https://minikube.sigs.k8s.io/docs/start/)
-- Cert-manager. Installation on kubernetes please refer to [cert-manager docs](https://cert-manager.io/docs/installation/kubernetes/). Or you can install by the following command.
+- A well-prepared kubernetes cluster. Follow the [instructions](https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm/) to create a kubernetes cluster, or create a local kubernetes node referring to [kind](https://kind.sigs.k8s.io/docs/user/quick-start/) or [minikube](https://minikube.sigs.k8s.io/docs/start/)
+- Cert-manager. Installation on kubernetes please refer to [cert-manager docs](https://cert-manager.io/docs/installation/kubernetes/). Or you can install it by the following command.
 ```bash
 kubectl create -f ./config/certmanager/cert-manager.yaml
 ```
@@ -16,7 +16,7 @@ kubectl create -f ./config/di-manager.yaml
 
 `di-operator` and `di-server` will be installed in `di-system` namespace. 
 ```bash
-$ kubectl get pod -n -system
+$ kubectl get pod -n di-system
 NAME                               READY   STATUS    RESTARTS   AGE
 di-operator-57cc65d5c9-5vnvn   1/1     Running   0          59s
 di-server-7b86ff8df4-jfgmp     1/1     Running   0          59s
@@ -32,7 +32,7 @@ kubectl create -f examples/di_v1alpha1_agconfig.yaml -n di-system
 $ kubectl create -f examples/di_v1alpha1_dijob.yaml
 
 # get pod and you will see coordinator is created by di-operator
-# few seconds later, you will see collectors and learners created by di-server
+# a few seconds later, you will see collectors and learners created by di-server
 $ kubectl get pod
 
 # get logs of coordinator
@@ -43,4 +43,6 @@ $ kubectl logs dijob-example-coordinator
 Refers to [user-guide](./docs/architecture.md). For Chinese version, please refer to [中文手册](./docs/architecture-cn.md)
 
 ## Contributing
-Refers to [developer-guide](./docs/developer-guide.md). Contact us throw <opendilab.contact@gmail.com>
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+Refers to [developer-guide](./docs/developer-guide.md). 
+
+Contact us throw <opendilab.contact@gmail.com>
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