Align doctor docs with CLI output

docs/host-requirements.md

@@ -25,7 +25,19 @@ The current implementation uses `sudo -n` for host networking commands when a ne
 pyro doctor
 ```
 
-Check these fields in the output:
+In the default human-readable output, check:
+
+- `Runtime: PASS`
+- `KVM: exists=yes readable=yes writable=yes`
+- `Networking: tun=yes ip_forward=yes`
+
+If you need the raw structured fields instead:
+
+```bash
+pyro doctor --json
+```
+
+Check:
 
 - `runtime_ok`
 - `kvm`