docs(self-hosted): add poolers how-to guide (#49303)

docker/.env.example

@@ -114,7 +114,7 @@ POSTGRES_DB=postgres
 # Default configuration includes Supavisor exposing POSTGRES_PORT
 # Postgres uses POSTGRES_PORT inside the container
 # Documentation:
-# https://supabase.com/docs/guides/self-hosting/docker#accessing-postgres-through-supavisor
+# https://supabase.com/docs/guides/self-hosting/accessing-postgres
 POSTGRES_PORT=5432
 
 
@@ -141,7 +141,7 @@ POOLER_MAX_CLIENT_CONN=100
 
 # Unique Supavisor tenant identifier
 # Documentation:
-# https://supabase.com/docs/guides/self-hosting/docker#accessing-postgres
+# https://supabase.com/docs/guides/self-hosting/accessing-postgres
 POOLER_TENANT_ID=your-tenant-id
 
 # Pool size for internal metadata storage used by Supavisor