docs(flexible-ip): update docs (#3125)

Author: yfodil

docs/data-sources/flexible_ip.md

@@ -11,33 +11,26 @@ Gets information about a Flexible IP.
 
 ```hcl
 # Get info by IP address
-data "scaleway_flexible_ip" "my_ip" {
+data "scaleway_flexible_ip" "with_ip" {
   ip_address = "1.2.3.4"
 }
 
 # Get info by IP ID
-data "scaleway_flexible_ip" "my_ip" {
-  ip_id = "11111111-1111-1111-1111-111111111111"
+data "scaleway_flexible_ip" "with_id" {
+  flexible_ip_id = "11111111-1111-1111-1111-111111111111"
 }
 ```
 
 ## Argument Reference
 
 - `ip_address` - (Optional) The IP address.
-  Only one of `ip_address` and `ip_id` should be specified.
+  Only one of `ip_address` and `flexible_ip_id` should be specified.
 
 - `flexible_ip_id` - (Optional) The IP ID.
   Only one of `ip_address` and `flexible_ip_id` should be specified.
 
-## Attributes Reference
-
-In addition to all above arguments, the following attributes are exported:
+- `project_id` - (Optional. Defaults to [provider](../index.md#project_id) `project_id`) The ID of the Project the Flexible IP is associated with.
 
-- `id` - The ID of the flexible IP.
-
-~> **Important:** Flexible IPs' IDs are [zoned](../guides/regions_and_zones.md#resource-ids), which means they are of the form `{zone}/{id}`, e.g. `fr-par-1/11111111-1111-1111-1111-111111111111`
+## Attributes Reference
 
-- `reverse` - The reverse domain associated with this IP.
-- `server_id` - The associated server ID if any
-- `organization_id` - (Defaults to [provider](../index.md#organization_id) `organization_id`) The ID of the organization the IP is in.
-- `project_id` - (Defaults to [provider](../index.md#project_id) `project_id`) The ID of the project the IP is in.
+Exported attributes are the ones from `flexible_ip` [resource](../resources/flexible_ip.md)

docs/resources/flexible_ip.md

@@ -78,7 +78,7 @@ The following arguments are supported:
 - `reverse` - (Optional) The reverse domain associated with this flexible IP.
 - `is_ipv6` - (Optional) Defines whether the flexible IP has an IPv6 address.
 - `zone` -(Defaults to [provider](../index.md#zone) `zone`) The [zone](../guides/regions_and_zones.md#zones) of the Flexible IP.
-
+- `project_id` - (Defaults to [provider](../index.md#project_id) `project_id`) The ID of the Project the Flexible IP is associated with.
 
 ## Attributes Reference
 
@@ -94,7 +94,6 @@ In addition to all arguments above, the following attributes are exported:
 - `created_at` - The date and time of the creation of the Flexible IP (Format ISO 8601).
 - `updated_at` - The date and time of the last update of the Flexible IP (Format ISO 8601).
 - `organization_id` - The organization of the Flexible IP.
-- `project_id` - The project of the Flexible IP.
 
 ## Import