minor #35999 [Mime] remove phpdoc mentioning Utf8AddressEncoder (dmai…

…cher)

This PR was submitted for the 4.3 branch but it was merged into the 4.4 branch instead.

Discussion
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[Mime] remove phpdoc mentioning Utf8AddressEncoder

This class does not exist

| Q             | A
| ------------- | ---
| Branch?       | 4.3
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | -
| License       | MIT
| Doc PR        | -

I'm currently migrating from Swiftmailer fo Symfony mailer and stumbled upon this exception:

https://github.com/symfony/symfony/blob/master/src/Symfony/Component/Mime/Encoder/IdnAddressEncoder.php#L44

The phpdoc of the class is a bit confusing/wrong. Seems to be a copy&paste leftover from Swiftmailer:

https://github.com/swiftmailer/swiftmailer/blob/master/lib/classes/Swift/AddressEncoder/IdnAddressEncoder.php#L19

Commits
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a85fb6c [Mime] remove phpdoc mentioning Utf8AddressEncoder

src/Symfony/Component/Mime/Encoder/IdnAddressEncoder.php

@@ -20,9 +20,7 @@
  * SMTP servers.
  *
  * This encoder does not support email addresses with non-ASCII characters in
- * local-part (the substring before @). To send to such addresses, use
- * Utf8AddressEncoder together with SmtpUtf8Handler. Your outbound SMTP server must support
- * the SMTPUTF8 extension.
+ * local-part (the substring before @).
  *
  * @author Christian Schmidt
  */