docs(deploy): use the helper names the shell actually defines

The runbook told the operator to run n-deploy, n-ping, n-cert, n-svcs,
n-ps and n-logs. None of those exist: the umbrella flake defines them
unprefixed (deploy, ping, cert, svcs, logs), and n-ps was never a name
under any prefix -- it is svcs. librescout/DEPLOY.md was already correct
and is the reference shape.

logs() already passes --tail=100 before appending arguments, so a
trailing --tail=200 only worked because the last flag wins.

DEPLOY.md

@@ -38,7 +38,7 @@ ssh netcup 'cd /srv/librenotes && docker compose -f compose.yaml -f compose.netc
 ## 4. Update deploy
 
 ```sh
-n-deploy librenotes
+deploy librenotes
 # Bump LIBRENOTES_IMAGE in /srv/librenotes/.env then:
 ssh netcup 'cd /srv/librenotes && docker compose -f compose.yaml -f compose.netcup.yaml pull && docker compose -f compose.yaml -f compose.netcup.yaml up -d'
 ```
@@ -46,10 +46,10 @@ ssh netcup 'cd /srv/librenotes && docker compose -f compose.yaml -f compose.netc
 ## 5. Smoke / health
 
 ```sh
-n-ping ln.cloud.librete.ch
-n-cert ln.cloud.librete.ch
-n-svcs librenotes
-n-logs librenotes librenotes --tail=200
+ping ln.cloud.librete.ch
+cert ln.cloud.librete.ch
+svcs librenotes
+logs librenotes librenotes --tail=100
 ```
 
 UI smoke: signup magic-link email arrives, login succeeds, note creation persists.