doc(lb): update SNI/HTTP host header constraints on Routes (#1972)

* doc(lb): update SNI/HTTP host headers constraints on Routes

* fix

* lint

Author: yfodil

docs/resources/lb_route.md

@@ -5,12 +5,12 @@ page_title: "Scaleway: scaleway_lb_route"
 
 # scaleway_lb_route
 
-Creates and manages Scaleway Load-Balancer Routes. For more information, see [the documentation](https://www.scaleway.com/en/developers/api/load-balancer/zoned-api/#path-route).
-It is useful to manage the Service Name Indicator (SNI) for a route between a frontend and a backend.
+Creates and manages Scaleway Load-Balancer Routes.
+For more information, see [the documentation](https://www.scaleway.com/en/developers/api/load-balancer/zoned-api/#path-route).
 
 ## Examples
 
-### With SNI
+### With SNI for direction to TCP backends
 
 ```hcl
 resource "scaleway_lb_ip" "ip01" {}
@@ -41,7 +41,7 @@ resource "scaleway_lb_route" "rt01" {
 }
 ```
 
-### With host-header
+### With host-header for direction to HTTP backends
 
 ```hcl
 resource "scaleway_lb_ip" "ip01" {}
@@ -54,7 +54,7 @@ resource "scaleway_lb" "lb01" {
 
 resource "scaleway_lb_backend" "bkd01" {
   lb_id            = scaleway_lb.lb01.id
-  forward_protocol = "tcp"
+  forward_protocol = "http"
   forward_port     = 80
   proxy_protocol   = "none"
 }
@@ -78,10 +78,16 @@ The following arguments are supported:
 
 - `backend_id` - (Required) The ID of the backend to which the route is associated.
 - `frontend_id` - (Required) The ID of the frontend to which the route is associated.
-- `match_sni` - The Server Name Indication TLS extension field from an incoming connection made via an SSL/TLS transport layer.
+- `match_sni` - The Server Name Indication (SNI) value to match. Value to match in the Server Name Indication TLS extension (SNI) field from an incoming connection made via an SSL/TLS transport layer.
   Only one of `match_sni` and `match_host_header` should be specified.
-- `match_host_header` - The Host request header specifies the host of the server to which the request is being sent.
+
+~> **Important:** This field should be set for routes on TCP Load Balancers.
+
+- `match_host_header` - The HTTP host header to match. Value to match in the HTTP Host request header from an incoming connection.
   Only one of `match_sni` and `match_host_header` should be specified.  
+
+~> **Important:** This field should be set for routes on HTTP Load Balancers.
+
 - `zone` - (Defaults to [provider](../index.md#zone) `zone`) The [zone](../guides/regions_and_zones.md#zones) in which the load-balancer was created.
 
 ## Attributes Reference