docs: recommend 'localhost' instead of '@Local' to be consistent with --help

also looks prettier, because @Local is highlighted weirdly

Author: missytake

doc/source/getting_started.rst

@@ -61,7 +61,7 @@ steps. Please substitute it with your own domain.
 
    ::
 
-       scripts/cmdeploy run --ssh-host @local
+       scripts/cmdeploy run --ssh-host localhost
 
    This script will also check that you have all necessary DNS records.
    If DNS records are missing, it will recommend which you should
@@ -76,13 +76,13 @@ to enable federation with other relays:
 
 ::
 
-   scripts/cmdeploy dns --ssh-host @local
+   scripts/cmdeploy dns --ssh-host localhost
 
 You should also test whether your chatmail service is working correctly:
 
 ::
 
-   scripts/cmdeploy test --ssh-host @local
+   scripts/cmdeploy test --ssh-host localhost
 
 Other Helpful Commands
 ----------------------
@@ -91,14 +91,14 @@ To check the status of your chatmail relay:
 
 ::
 
-   scripts/cmdeploy status --ssh-host @local
+   scripts/cmdeploy status --ssh-host localhost
 
 
 To measure the performance of your chatmail service:
 
 ::
 
-   scripts/cmdeploy bench --ssh-host @local
+   scripts/cmdeploy bench --ssh-host localhost