Merge pull request rails#50228 from cedriccarrard/fix-50189-docs-mismatch-between-revert-code-example-and-subsequent-steps

Adjusted an example to align with the documentation section on reversing a previous migration.

Author: rafaelfranca

guides/source/active_record_migrations.md

@@ -854,6 +854,10 @@ class DontUseDistributorsViewMigration < ActiveRecord::Migration[8.0]
   def change
     revert do
       # copy-pasted code from ExampleMigration
+      create_table :distributors do |t|
+        t.string :zipcode
+      end
+
       reversible do |direction|
         direction.up do
           # create a distributors view