Update guide_ha_tunnel.md

Author: mattalberts

docs/guide_ha_tunnel.md

@@ -1,6 +1,6 @@
 # High Availability with Argo Tunnels
-A guild to setting up high availability with argo tunnels to span
-Kubernetes clusters or even cloud providers.
+A guide to setting up high availability with argo tunnels to span replicas,
+Kubernetes clusters, or even cloud providers.
 
 - Spanning Clusters
 
@@ -13,6 +13,8 @@ traffic across all tunnels.
 ### Requirements
 - Load balancing enabled, [enable here][cloudflare-dashboard-traffic]
 
+> A load-balancer is required to set the controller replica count > 1.
+
 ### Step 1: Create a Load Balancer
 On the Cloudflare dashboard, browse to [Traffic][cloudflare-dashboard-traffic]
 and create a load balancer named `echo-lb-pool`. Additional details can be found
@@ -28,4 +30,4 @@ kubectl annotate ing echo "argo.cloudflare.com/lb-pool=echo-lb-pool"
 
 [cloudflare-dashboard-traffic]: https://www.cloudflare.com/a/traffic/
 [cloudflare-reference-load-balancing]: https://developers.cloudflare.com/argo-tunnel/reference/load-balancing/
-[guide-first-tunnel]: ./guide_first_tunnel.md
+[guide-first-tunnel]: ./guide_first_tunnel.md