fix(ipam): fix headres

Author: RoRoJ

network/ipam/reference-content/ipv6.mdx

@@ -35,15 +35,15 @@ The following products support IPv6:
 
 Scaleway Instances are compatible with IPv6, with the caveat that the Instance must be using [routed IPs](/compute/instances/concepts/#routed-flexible-ip). Recently created Instances use routed IPs by default, older Instances may need to be [moved manually to routed IPs](/compute/instances/how-to/migrate-routed-ips/).
 
-### Public IPv6 
+#### Public IPv6 
 
 You can attach one or multiple public (flexible) IPv6 addresses to your Instance, as well as, or instead of, a public IPv4 address. These public addresses are flexible, meaning that you can detach them from an Instance, hold them in your account, and attach them to a different Instance later, if you want. Each flexible IPv6 address is a `/64` IPv6 subnet.
 
-### Private IPv6 
+#### Private IPv6 
 
 When you attach an Instance to a Private Network, it gets both an IPv4 and an IPv6 address on that network. You can either let IPAM auto-allocate any available address, or specify a [reserved IP address](/network/ipam/how-to/reserve-ip/) to use.
 
-### Going further
+#### Going further
 
 Go further with Instances and IPv6 in the following documentation:
 
@@ -57,17 +57,17 @@ Go further with Instances and IPv6 in the following documentation:
 
 Scaleway Elastic Metal servers are compatible with IPv6. 
 
-### Public IPv6
+#### Public IPv6
 
 You can attach one or multiple public (flexible) IPv6 addresses to your Elastic Metal server, as well as, or instead of, a public IPv4 address. These public addresses are flexible, meaning that you can detach them from an Elastic Metal server, hold them in your account, and attach them to a different Elastic Metal server, if you want. Each flexible IPv6 address is a `/64` IPv6 subnet. Flexible IPv6 addresses can also be used as additional IP addresses to create virtual machines on your Elastic Metal server.
 
-### Private IPv6 
+#### Private IPv6 
 
 When you attach an Elastic Metal server to a Private Network, it gets both an IPv4 and an IPv6 address on that network.  You can either let IPAM auto-allocate any available address, or specify a [reserved IP address](/network/ipam/how-to/reserve-ip/) to use.
 
 You can also use IPAM's [reserve a private IP](https://www.scaleway.com/en/developers/api/ipam/#path-ips-reserve-a-new-ip) and [attach IP to custom resource](https://www.scaleway.com/en/developers/api/ipam/#path-ips-attach-ip-to-custom-resource) feature to attach an IPv6 address to a named resource via its MAC address. This is suitable for ensuring virtual machines on your Elastic Metal server get private IPv6 addresses.
 
-### Going further
+#### Going further
 
 Go further with Elastic Metal and IPv6 in the following documentation:
 - [How to order a flexible IP](/bare-metal/elastic-metal/how-to/order-flexible-ip/)
@@ -86,19 +86,19 @@ Full information on IPv6 with Dedibox can be found in our [dedicated documentati
 
 Scaleway Load Balancers are compatible with IPv6. 
 
-### Public IPv6 
+#### Public IPv6 
 
 You can attach a maximum of one (flexible) IPv6 address to your Load Balancer, in addition to a flexible IPv4 address. The Load Balancer cannot have **only** an IPv6 address. Once attached, the IPv6 address cannot be detached or changed for a different one. Each flexible IPv6 address is a `/64` IPv6 subnet.
 
-### Private IPv6 
+#### Private IPv6 
 
 When you attach a Load Balancer to a Private Network, it gets both an IPv4 and an IPv6 address on that network. You can either let IPAM auto-allocate any available address, or specify a [reserved IP address](/network/ipam/how-to/reserve-ip/) to use.
 
-### IPv6 at the backend
+#### IPv6 at the backend
 
 Load Balancers can also use IPv6 to communicate with their backend servers. When you attach backend servers to a Load Balancer, you can either specify their public IPv6 address, or their private IPv6 address (if the Load Balancer and the backend servers are attached to the same Private Network).
 
-### Going further
+#### Going further
 
 Go further with IPv6 and Load Balancers with the following documentation:
 - [How to create and manage flexible IPs](/network/load-balancer/how-to/create-manage-flex-ips/)