chore(docs): typo fixing in agent README file (#351)

Signed-off-by: rick <[email protected]>

Author: LinuxSuRen

agent/README.md

@@ -7,7 +7,7 @@ The main difference is that the agent is syncing one Git repository into the sam
 
 ## Quick Start
 
-By default the agent is configured to use manifests from [guestbook](https://github.com/argoproj/argocd-example-apps/tree/master/guestbook)
+By default, the agent is configured to use manifests from [guestbook](https://github.com/argoproj/argocd-example-apps/tree/master/guestbook)
 directory in https://github.com/argoproj/argocd-example-apps repository.
 
 The agent supports two modes:
@@ -24,7 +24,7 @@ kubectl apply -f https://raw.githubusercontent.com/argoproj/gitops-engine/master
 kubectl rollout status deploy/gitops-agent
 ```
 
-The the agent logs:
+The agent logs:
 
 ```bash
 kubectl logs -f deploy/gitops-agent gitops-agent