fix(pgw): remove duplicate H2 (scaleway#3897)

Author: RoRoJ

network/public-gateways/how-to/create-a-public-gateway.mdx

@@ -22,8 +22,6 @@ categories:
 
 ## How to create a Public Gateway
 
-## How to create a Public Gateway
-
 1. Click **Public Gateways** in the **Network** section of the side menu.
 2. Click **Create Public Gateway** to launch the Public Gateway creation wizard.
 3. Complete the following steps in the wizard: