fix: remove incorrect description

We cannot specify negative number as an option value on CLI.

Author: kenjis

system/Commands/Database/MigrateRollback.php

@@ -57,7 +57,7 @@ class MigrateRollback extends BaseCommand
      * @var array
      */
     protected $options = [
-        '-b' => 'Specify a batch to roll back to; e.g. "3" to return to batch #3 or "-2" to roll back twice',
+        '-b' => 'Specify a batch to roll back to; e.g. "3" to return to batch #3',
         '-g' => 'Set database group',
         '-f' => 'Force command - this option allows you to bypass the confirmation question when running this command in a production environment',
     ];

user_guide_src/source/dbmgmt/migration.rst

@@ -144,7 +144,7 @@ Rolls back all migrations, taking the database group to a blank slate, effective
 You can use (rollback) with the following options:
 
 - ``-g`` - to choose database group, otherwise default database group will be used.
-- ``-b`` - to choose a batch: natural numbers specify the batch, negatives indicate a relative batch
+- ``-b`` - to choose a batch: natural numbers specify the batch.
 - ``-f`` - to force a bypass confirmation question, it is only asked in a production environment
 
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