update readme for kube agent (#49366)

examples/chart/teleport-kube-agent/README.md

@@ -13,7 +13,7 @@ To use it, you will need:
 - a reachable proxy endpoint (`$PROXY_ENDPOINT` e.g. `teleport.example.com:3080` or `teleport.example.com:443`)
 - a reachable reverse tunnel port on the proxy (e.g. `teleport.example.com:3024`). The address is automatically
   retrieved from the Teleport proxy configuration.
-- a join token for the Teleport Cluster. For this Teleport cluster (`$JOIN_TOKEN`) is used by default. See the [Join Methods and Token Reference](https://goteleport.com/docs/reference/join-methods/) for supproted join methods and creating tokens.
+- a join token for the Teleport Cluster. For this Teleport cluster (`$JOIN_TOKEN`) is used by default. See the [Join Methods and Token Reference](https://goteleport.com/docs/reference/join-methods/) for supported join methods and creating tokens.
 
 ## Combining roles