This PR was squashed before being merged into the 6.2 branch.

Discussion
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Update setup.rst ( version 6.2 )

Commits
-------

b7438ff Update setup.rst ( version 6.2 )

* 6.1:
  Fix: Use correct SF version

* 6.1:
  [HtmlSanitizer] Fix wrong method name

* 6.1:
  Add the versionadded directive
  Add information about DateTimeValueResolver

* 6.1:
  Fix options path in composer.json

* 6.1:
  [Frontend] Remove an unused reference

…aviereguiluz)

This PR was merged into the 6.2 branch.

Discussion
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[Security] Move the Security helper to SecurityBundle

Fixes #16846.

Commits
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c7369d5 [Security][SecurityBundle] Move the Security helper to SecurityBundle

* 6.1:
  Fix second twig path reference to be consistent with the first reference on security documentation

* 6.1:
  [HtmlSanitizer] Fix a few typos in the introduction

* 6.1:
  Remove the deprecated SetUpTearDownTrait feature
  [PhpUnitBridge] Mention the SetUpTearDownTrait deprecation

* 6.1:
  Add assets to the documentation
  add caution to URL-encode special characters in Notifier DSNs
  [Form][NumberType] Fix constants
  Fix development testing examples

* 6.1:
  [Validator] Update validation.rst

This PR was squashed before being merged into the 6.2 branch.

Discussion
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[Security] Enforce maximum username length

Fixes #16856.

Commits
-------

0e14ecf [Security] Enforce maximum username length

* 6.1:
  [Notifier] Added the Engagespot push notification

* 6.1:
  Update questionhelper.rst
  Reword
  hint about creating config/routes/annotations.yaml as well, when using attributes without doctrine/annotations.

* 6.1:
  [Doctrine] Add attribute example for Lifecycle Callbacks

* 6.1:
  Use HTML syntax highlighting
  Update http_kernel_httpkernelinterface.rst

* 6.1:
  [Translation] Update locale.rst

* 6.1:
  Remove deprecated Docs ind "lock"

* 6.1:
  [Frontend] Update UX package list
  New features must go on the 6.x branch

…(fabpot)

This PR was merged into the 6.2 branch.

Discussion
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[Mailer] Add more information about sending email async

The example only works as of 6.2 thanks to symfony/symfony#47075

I've written this PR because we keep having issues like symfony/symfony#44439.
So, documenting a bit more how it works internally might help people understand what to do.

Commits
-------

4fbbc16 Add more information about sending email async

* 6.1:
  [Routing] Fix some internal references links
  Add links to each Symfony UX component demo
  Linking to ux.symfony.com

* 6.1:
  [Messenger] fix broken link to Validator component

* 6.1:
  Update mercure.rst
  [HttpKernel] Add UidValueResolver to the list of built-in value resolvers
  Adding missing `use`s

* 6.1:
  Be more detailed about coding standards for PHPdoc

* 6.1:
  Update README.markdown

* 6.1:
  Adding class constants

* 6.1:
  [ExpressionLanguage] Feature Null-coalescing operator

* 6.1:
  fix reference markup