change the order of cli arguments

Author: sondrele

docs/persistence/postgres/how-to/migrate-to-new-instance.md

@@ -46,7 +46,7 @@ We have written a more detailed explanation of the process in the [explanation s
 2. Run the [setup](../../../operate/cli/reference/postgres.md#migrate-setup) command and follow the prompts
 
     ```shell
-    nais migrate postgres setup <appname> <new-sql-instance-name>
+    nais postgres migrate setup <appname> <new-sql-instance-name>
     ```
 
 3. Check that the replication is up to date by checking the URL you got from the setup command.
@@ -62,7 +62,7 @@ We have written a more detailed explanation of the process in the [explanation s
 1. Run the [promote](../../../operate/cli/reference/postgres.md#migrate-promote) command and follow the instructions
 
     ```shell
-    nais migrate postgres promote <appname> <new-sql-instance-name>
+    nais postgres migrate promote <appname> <new-sql-instance-name>
     ```
 
 2. Check that the application is running as expected, and that all data is available in the new SQLInstance.
@@ -81,7 +81,7 @@ We have written a more detailed explanation of the process in the [explanation s
 1. Run the [finalize](../../../operate/cli/reference/postgres.md#migrate-finalize) command
 
     ```shell
-    nais migrate postgres finalize <appname> <new-sql-instance-name>
+    nais postgres migrate finalize <appname> <new-sql-instance-name>
     ```
 
 ## Rolling back the migration
@@ -91,5 +91,5 @@ If you decide to not go through with the migration, you can roll back to the old
 1. Run the [rollback](../../../operate/cli/reference/postgres.md#migrate-rollback) command
 
     ```shell
-    nais migrate postgres rollback <appname> <new-sql-instance-name>
+    nais postgres migrate rollback <appname> <new-sql-instance-name>
     ```