minor #4703 Fix representation (ifdattic)

This PR was merged into the 2.3 branch.

Discussion
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Fix representation

It might be just me, but with `unless` it sounds like **if you want to use your forms in multiple places you should define it in your controllers**.

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

Commits
-------

6a55617 Update forms.rst
3d62349 Fix representation

best_practices/forms.rst

@@ -13,8 +13,8 @@ Building Forms
     Define your forms as PHP classes.
 
 The Form component allows you to build forms right inside your controller
-code. Honestly, unless you need to reuse the form somewhere else, that's
-totally fine. But for organization and reuse, we recommend that you define each
+code. This is perfectly fine if you don't need to reuse the form somewhere else.
+But for organization and reuse, we recommend that you define each
 form in its own PHP class::
 
     namespace AppBundle\Form;