Fixed typo

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 2.3
| Fixed tickets |

Author: ThomasLandauer

book/doctrine.rst

@@ -1094,7 +1094,7 @@ table, and ``product.category_id`` column, and new foreign key:
 
 .. note::
 
-    This task should only be really used during development. For a more robust
+    This command should only be used during development. For a more robust
     method of systematically updating your production database, read about
     `migrations`_.