Merge pull request #38397 from hoffin/master

Automatic merge from submit-queue

Correct docs

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**What this PR does / why we need it**:
There was a change to the registry-proxy but the documentaiton wasn't completely updated to reflect change made.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
Linked to [contribute deis/registry-proxy as a replacement for kube-registry-proxy](https://github.com/kubernetes/kubernetes/pull/35797)

**Special notes for your reviewer**:
First time contributing.
**Release note**:
<!--  Steps to write your release note:
1. Use the release-note-* labels to set the release note state (if you have access) 
2. Enter your extended release note in the below block; leaving it blank means using the PR title as the release note. If no release note is required, just write `NONE`. 
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```release-note
Updated the kube-registry-proxy readme example.
```

cluster/addons/registry/README.md

@@ -198,11 +198,9 @@ spec:
       value: kube-registry.kube-system.svc.cluster.local
     - name: REGISTRY_PORT
       value: "5000"
-    - name: FORWARD_PORT
-      value: "5000"
     ports:
     - name: registry
-      containerPort: 5000
+      containerPort: 80
       hostPort: 5000
 ```
 <!-- END MUNGE: EXAMPLE ../../saltbase/salt/kube-registry-proxy/kube-registry-proxy.yaml -->