Updates k8s annotation docs

Updates k8s annotation docs for the  options added in hashicorp/consul-k8s#1315.

website/content/docs/k8s/annotations-and-labels.mdx

@@ -233,6 +233,8 @@ The following Kubernetes resource annotations could be used on a pod to control
 - `consul.hashicorp.com/service-metrics-port` - Set the port where the Connect service exposes metrics.
 - `consul.hashicorp.com/service-metrics-path` - Set the path where the Connect service exposes metrics.
 - `consul.hashicorp.com/connect-inject-mount-volume` - Comma separated list of container names to mount the connect-inject volume into. The volume will be mounted at `/consul/connect-inject`. The connect-inject volume contains Consul internals data needed by the other sidecar containers, for example the `consul` binary, and the Pod's Consul ACL token. This data can be valuable for advanced use-cases, such as making requests to the Consul API from within application containers.
+- `consul.hashicorp.com/consul-sidecar-user-volume` - JSON objects that define Volumes to be added to the Envoy sidecar.
+- `consul.hashicorp.com/consul-sidecar-user-volume-mount` - JSON objects that define VolumeMounts to be added to the Envoy sidecar.
 
 ## Labels