[MT] Refined IPv6 text (#21395)

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Author: marciocloudflare

src/content/docs/magic-transit/how-to/ipv6.mdx

@@ -37,7 +37,7 @@ Since IPv6 works over an existing IPv4 tunnel you will need to choose either an
 To configure IPv6:
 
 1. Follow the instructions on how to [add a GRE tunnel](/magic-transit/how-to/configure-tunnels/#add-tunnels).
-2. In **IPv6 Interface address**, enter the IPv6 address you received from Cloudflare to use on the Cloudflare side of the tunnel.
-3. Use the other IPv6 address you received from your team to configure in your router.
+2. In **IPv6 Interface address** enter the IPv6 address assigned to you by Cloudflare for the Cloudflare side of the GRE tunnel. This address is part of a `/127` subnet that is provided to you by your Cloudflare team.
+3. Use the other IPv6 address you received from your team to configure your router.
 
 For IPv6 traffic over IPv4 tunnels, the same [MSS clamping](/magic-transit/reference/mtu-mss/#mss-clamping) recommendations apply.