fix(vpc): add region selector to troubleshooting

Author: RoRoJ

pages/vpc/troubleshooting/assets/scaleway-vpc-pns.webp

@@ -46,6 +46,10 @@ The VPC must contain no Private Networks before you can delete it.
 
     <Lightbox image={image} alt="A screenshot of the Scaleway console highlights the Private Networks column on the VPC listing" />
 
+<Message type="tip">
+Ensure you have selected the correct region from the region selector in the top left corner of the screen, to ensure you are viewing a full listing of your VPCs in that region.
+</Message>
+
 In order to successfully delete a Private Network, you must ensure no resources are attached to it, and there are no private IPs reserved within the network. See the [information below](#i-cant-delete-my-private-network) for full details.
 
 ## I can't delete my Private Network