Fix incorrect port mapping in example

Getting-Started.md

@@ -175,14 +175,14 @@ docker build -f Dockerfile.local --no-cache -t localregistry/seaweedfs .
 You can use docker volumes to persist data:
 ```bash
 # start our weed server daemonized
-docker run --name weed -d -p 9333:9333 -p 8080:8080 -p 18080:8080 \
+docker run --name weed -d -p 9333:9333 -p 8080:8080 -p 18080:18080 \
   -v seaweedvolume:/data chrislusf/seaweedfs server -dir="/data"
 ```
 
 Alternatively, you can mount a directory on the host machine into the container:
 ```bash
 # start our weed server daemonized
-docker run --name weed -d -p 9333:9333 -p 8080:8080 -p 18080:8080 \
+docker run --name weed -d -p 9333:9333 -p 8080:8080 -p 18080:18080 \
   -v /opt/weedfs/data:/data chrislusf/seaweedfs server -dir="/data"
 ```
 Note that according to [Docker's documentation](https://docs.docker.com/storage/volumes/), volumes are the preferred mechanism for persisting data.