Fix the link and content for upgrade instruction

Signed-off-by: Daniel Jiang <jiangd@vmware.com>

site/content/docs/v1.7/upgrade-to-1.7.md

@@ -44,11 +44,14 @@ If you're not yet running at least Velero v1.6, see the following:
 
     **NOTE:** If you are upgrading Velero in Kubernetes 1.14.x or earlier, you will need to use `kubectl apply`'s `--validate=false` option when applying the CRD configuration above. See [issue 2077][10] and [issue 2311][11] for more context.
 
-1. Update the container image used by the Velero deployment and, optionally, the restic daemon set:
+1. Update the container image used by the Velero deployment, plugin and, optionally, the restic daemon set:
 
     ```bash
+   # set the container and image of the init container for plugin accordingly, 
+   # if you are using other plugin
     kubectl set image deployment/velero \
         velero=velero/velero:v1.7.0 \
+        velero-velero-plugin-for-aws=velero/velero-plugin-for-aws:v1.3.0 \
         --namespace velero
 
     # optional, if using the restic daemon set

site/data/docs/main-toc.yml

@@ -13,8 +13,8 @@ toc:
         url: /basic-install
       - page: Customize Installation
         url: /customize-installation
-      - page: Upgrade to 1.6
-        url: /upgrade-to-1.6
+      - page: Upgrade to 1.7
+        url: /upgrade-to-1.7
       - page: Supported providers
         url: /supported-providers
       - page: Evaluation install

site/data/docs/v1-7-toc.yml

@@ -13,8 +13,8 @@ toc:
         url: /basic-install
       - page: Customize Installation
         url: /customize-installation
-      - page: Upgrade to 1.6
-        url: /upgrade-to-1.6
+      - page: Upgrade to 1.7
+        url: /upgrade-to-1.7
       - page: Supported providers
         url: /supported-providers
       - page: Evaluation install