Improve documentation for adding taint in HA installation (#1765)

* Improve documentation for adding taint in HA installation

* request changes fix

* request changes fix

docs/install/ha.md

@@ -56,6 +56,8 @@ node-taint:
   - "CriticalAddonsOnly=true:NoExecute"
 ```
 
+Note: The NGINX Ingress and Metrics Server addons will **not** be deployed when all nodes are tainted with `CriticalAddonsOnly`. If your server nodes are so tainted, these addons will remain pending until untainted agent nodes are added to the cluster.
+
 ### 3. Launch additional server nodes
 Additional server nodes are launched much like the first, except that you must specify the `server` and `token` parameters so that they can successfully connect to the initial server node.