docs: unify See also/Related headings across remaining pages

docs/platforms/digitalocean.md

@@ -258,7 +258,7 @@ free -h
 
 ---
 
-## See Also
+## Related
 
 - [Hetzner guide](/install/hetzner) — cheaper, more powerful
 - [Docker install](/install/docker) — containerized setup

docs/platforms/oracle.md

@@ -296,7 +296,7 @@ openclaw backup create
 
 ---
 
-## See Also
+## Related
 
 - [Gateway remote access](/gateway/remote) — other remote access patterns
 - [Tailscale integration](/gateway/tailscale) — full Tailscale docs

docs/platforms/raspberry-pi.md

@@ -411,7 +411,7 @@ echo 'wireless-power off' | sudo tee -a /etc/network/interfaces
 
 ---
 
-## See Also
+## Related
 
 - [Linux guide](/platforms/linux) — general Linux setup
 - [DigitalOcean guide](/platforms/digitalocean) — cloud alternative