minor #18765 [Mailer] Fix attachment changes (HeahDude)

This PR was squashed before being merged into the 6.3 branch.

Discussion
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[Mailer] Fix attachment changes

The title of symfony/symfony#47711 did not change before merge, but actually only `attachPart` has been deprecated (renamed) in favor of `addPart`.
I did not reintroduce the other methods as they may be deprecated in 7.1, so no need to document a way that may change in a few months.
Also the `BodyFile` class has been renamed in symfony/symfony#48060 whereas the use in the example code was correct.

Commits
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46923d0 [Mailer] Fix attachment changes

Author: javiereguiluz

mailer.rst

@@ -549,7 +549,8 @@ result of rendering some template) or PHP resources::
 File Attachments
 ~~~~~~~~~~~~~~~~
 
-Use the ``addPart()`` method with a ``BodyFile`` to add files that exist on your file system::
+Use the ``addPart()`` method with a ``File`` to add files that exist on your
+file system::
 
     use Symfony\Component\Mime\Part\DataPart;
     use Symfony\Component\Mime\Part\File;
@@ -564,7 +565,8 @@ Use the ``addPart()`` method with a ``BodyFile`` to add files that exist on your
         ->addPart(new DataPart(new File('/path/to/documents/contract.doc'), 'Contract', 'application/msword'))
     ;
 
-Alternatively you can attach contents from a stream by passing it directly to the ``DataPart`` ::
+Alternatively you can attach contents from a stream by passing it directly to
+the ``DataPart``::
 
     $email = (new Email())
         // ...
@@ -573,9 +575,9 @@ Alternatively you can attach contents from a stream by passing it directly to th
 
 .. deprecated:: 6.2
 
-    In Symfony versions previous to 6.2, the methods ``attachFromPath()`` and
-    ``attach()`` could be used to add attachments. These methods have been
-    deprecated and replaced with ``addPart()``.
+    In Symfony versions previous to 6.2, the method ``attachPart()`` could be
+    used to add attachments. This method has been deprecated and replaced
+    with ``addPart()``.
 
 Embedding Images
 ~~~~~~~~~~~~~~~~
@@ -616,13 +618,8 @@ images inside the HTML contents::
 
 .. versionadded:: 6.1
 
-    The support of embedded images as HTML backgrounds was introduced in Symfony 6.1.
-
-.. deprecated:: 6.2
-
-    In Symfony versions previous to 6.2, the methods ``embedFromPath()`` and
-    ``embed()`` could be used to embed images. These methods have been deprecated
-    and replaced with ``addPart()`` together with inline ``DataPart`` objects.
+    The support of embedded images as HTML backgrounds was introduced in Symfony
+    6.1.
 
 .. _mailer-configure-email-globally: