Make documentation standalone and generalize examples

docs/code/cli.md

@@ -57,7 +57,7 @@ that instance's running engine; plain mode refuses to start a duplicate.
 | `--admin-email ADDR` | `admin@example.com` | First admin account |
 | `--admin-password PW` | Generated | First admin password |
 | `--enroll CODE` | Unset | Enroll before starting, if not already paired |
-| `--portal URL` | `https://hub.fluksio.com` | Portal used by `--enroll` |
+| `--portal URL` | Built-in portal address | Portal used by `--enroll` |
 | `--max-runs N` | `4` | Concurrent batch runs |
 | `--max-cascades N` | `4` | Concurrent live cascades |
 | `--max-workers N` | `4` | Local Python worker processes |
@@ -106,7 +106,7 @@ from the instance's project directory, or select it explicitly.
 
 | Option | Purpose |
 |---|---|
-| `--portal URL` | Use another portal instead of `https://hub.fluksio.com` |
+| `--portal URL` | Use another compatible portal |
 | `--as EMAIL` | Choose the local superuser represented by portal sessions |
 | `--data-dir PATH` | Select instance storage |
 | `--global` | Select `~/.fluksio` |