minor #15414 [Form] Adds references to new Form themes (ker0x)

This PR was merged into the 5.3 branch.

Discussion
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[Form] Adds references to new Form themes

This PR adds references to the new themes introduced in Symfony 5.3.

Commits
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a0c1369 Adds references to new Form themes

Author: javiereguiluz

form/form_themes.rst

@@ -33,21 +33,32 @@ in a single Twig template and they are enabled in the
   updated for `Bootstrap 4 CSS framework`_ styles.
 * `bootstrap_4_horizontal_layout.html.twig`_, same as
   ``bootstrap_3_horizontal_layout.html.twig`` but updated for Bootstrap 4 styles.
+* `bootstrap_5_layout.html.twig`_, same as ``bootstrap_4_layout.html.twig``, but
+  updated for `Bootstrap 5 CSS framework`_ styles.
+* `bootstrap_5_horizontal_layout.html.twig`_, same as
+  ``bootstrap_4_horizontal_layout.html.twig`` but updated for Bootstrap 5 styles.
 * `foundation_5_layout.html.twig`_, wraps each form field inside a ``<div>``
   element with the appropriate CSS classes to apply the default styles of the
   version 5 of `Foundation CSS framework`_.
 * `foundation_6_layout.html.twig`_, wraps each form field inside a ``<div>``
   element with the appropriate CSS classes to apply the default styles of the
   version 6 of `Foundation CSS framework`_.
+* `tailwind_2_layout.html.twig`_, wraps each form field inside a ``<div>``
+  element with the absolute minimum styles to make them usable. It is based on the
+  `Tailwind CSS form plugin`_.
 
 .. versionadded:: 5.1
 
     The ``foundation_6_layout.html.twig`` was introduced in Symfony 5.1.
 
+.. versionadded:: 5.3
+
+    The ``bootstrap_5_layout.html.twig``, ``bootstrap_5_horizontal_layout.html.twig`` and ``tailwind_2_layout.html.twig`` were introduced in Symfony 5.3.
+
 .. tip::
 
-    Read the article about the :doc:`Bootstrap 4 Symfony form theme </form/bootstrap4>`
-    to learn more about it.
+    Read the articles about :doc:`Bootstrap 4 Symfony form theme </form/bootstrap4>` and :doc:`Bootstrap 5 Symfony form theme </form/bootstrap5>`
+    to learn more about them.
 
 .. _forms-theming-global:
 .. _forms-theming-twig:
@@ -635,10 +646,15 @@ is a collection of fields (e.g. a whole form), and not just an individual field:
 .. _`bootstrap_3_horizontal_layout.html.twig`: https://github.com/symfony/symfony/blob/master/src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_3_horizontal_layout.html.twig
 .. _`bootstrap_4_layout.html.twig`: https://github.com/symfony/symfony/blob/master/src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_4_layout.html.twig
 .. _`bootstrap_4_horizontal_layout.html.twig`: https://github.com/symfony/symfony/blob/master/src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_4_horizontal_layout.html.twig
+.. _`bootstrap_5_layout.html.twig`: https://github.com/symfony/symfony/blob/master/src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_5_layout.html.twig
+.. _`bootstrap_5_horizontal_layout.html.twig`: https://github.com/symfony/symfony/blob/master/src/Symfony/Bridge/Twig/Resources/views/Form/bootstrap_5_horizontal_layout.html.twig
 .. _`Bootstrap 3 CSS framework`: https://getbootstrap.com/docs/3.4/
-.. _`Bootstrap 4 CSS framework`: https://getbootstrap.com/docs/4.4/
+.. _`Bootstrap 4 CSS framework`: https://getbootstrap.com/docs/4.6/
+.. _`Bootstrap 5 CSS framework`: https://getbootstrap.com/docs/5.0/
 .. _`foundation_5_layout.html.twig`: https://github.com/symfony/symfony/blob/master/src/Symfony/Bridge/Twig/Resources/views/Form/foundation_5_layout.html.twig
 .. _`foundation_6_layout.html.twig`: https://github.com/symfony/symfony/blob/master/src/Symfony/Bridge/Twig/Resources/views/Form/foundation_6_layout.html.twig
 .. _`Foundation CSS framework`: https://get.foundation/
+.. _`tailwind_2_layout.html.twig`: https://github.com/symfony/symfony/blob/master/src/Symfony/Bridge/Twig/Resources/views/Form/tailwind_2_layout.html.twig
+.. _`Tailwind CSS form plugin`: https://tailwindcss-forms.vercel.app/
 .. _`Twig "use" tag`: https://twig.symfony.com/doc/2.x/tags/use.html
 .. _`Twig parent() function`: https://twig.symfony.com/doc/2.x/functions/parent.html